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Number

1,521

  • Positive
  • Odd
  • Composite
  • Perfect square
  • 4 digits

1,521 is an odd 4-digit integer and a composite number. It has 9 divisors and a digital root of 9.

Number properties

ParityOddnot divisible by 2
SignPositive
PrimalityComposite
Absolute value1,521
Digit count4
Digit sum9
Digital root9repeated digit sum
PalindromicNoreads differently backwards
Perfect squareYes, 39²
Happy numberYessquared-digit sums reach 1
Harshad numberYesdivisible by its own digit sum

Factors & divisors

Prime factorisation3^2 × 13^2
Distinct prime factors23, 13
Number of divisors9
Sum of divisors σ(n)2,379
Aliquot sum858sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)936integers below n that share no factor with it
SquarefreeNohas a repeated prime factor
All divisors1, 3, 9, 13, 39, 117, 169, 507, 1,5219 in total

Arithmetic

Previous number1,520
Next number1,522
Double3,042
Half760.5
Square2,313,441
Cube3,518,743,761
Square root39exact
Cube root11.500315051≈
Negation-1,521
Reciprocal0.0006574622≈

Representations

Decimal1,521
Binary1011111000111 bits
Octal2761
Hexadecimal5F1
Base 36169
Roman numeralMDXXI
In wordsone thousand, five hundred and twenty-one
Ordinalone thousand, five hundred and twenty-first
Scientific notation1.521 × 10^3
Engineering notation1.521 × 10^3

Nearest landmarks

Next prime1,523+2
Previous prime1,511−10
Distance to nearest prime2
Nearest square below1,521
Nearest square above1,600

Powers & multiples

1,521 to the power 22,313,441
1,521 to the power 33,518,743,761
1,521 to the power 45,352,009,260,481
1,521 to the power 58,140,406,085,191,601
First ten multiples1,521, 3,042, 4,563, 6,084, 7,605, 9,126, 10,647, 12,168, 13,689, 15,210
Powers of twoBetween 2^10 (1,024) and 2^11 (2,048)

Divisibility tests

Divisible by 2No, remainder 1
Divisible by 3Yes
Divisible by 4No, remainder 1
Divisible by 5No, remainder 1
Divisible by 6No, remainder 3
Divisible by 7No, remainder 2
Divisible by 8No, remainder 1
Divisible by 9Yes
Divisible by 10No, remainder 1
Divisible by 11No, remainder 3
Divisible by 12No, remainder 9
Divisible by 100No, remainder 21

Collatz (3n + 1) trajectory

Steps to reach 1109the total stopping time
Highest value reached9,2326× the starting value
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps1,521 → 4,564 → 2,282 → 1,141 → 3,424 → 1,712 → 856 → 428 → 214 → 107 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1

As a percentage & fraction

As a percentage152,100%
1,521% as a decimal15.21
1,521% of 1001,521
1,521% of 1,00015,210
As a fraction of 1001,521/100

Read another way

As seconds25 minutes and 21 seconds
As bytes1.485 KiB
As a year1521 AD
As a 24-bit colour#0005F1

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Neighbouring numbers

Nearby primes

Also reads as

1521 (year)

  • Common year
  • 365 days
  • 16th century
  • Snake

1521 was a common year of 365 days. It began on a Saturday and ended on a Saturday. Easter Sunday fell on 3 April.

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Structure of the year

Leap yearNonot divisible by 4
Days in the year365
Weeks in the year52ISO 8601 weeks; 28 December is always in the final week
Days in February28
1 January fell on aSaturday
31 December fell on aSaturday
Century16th century
Decade1520s
Chinese zodiacSnake
Easter Sunday3 April

Months of 1521

January31 days, starts Saturday
February28 days, starts Tuesday
March31 days, starts Tuesday
April30 days, starts Friday
May31 days, starts Sunday
June30 days, starts Wednesday
July31 days, starts Friday
August31 days, starts Monday
September30 days, starts Thursday
October31 days, starts Saturday
November30 days, starts Tuesday
December31 days, starts Thursday

Time references

These values depend on today’s date and change daily.

Unix timestamp at the start-14,169,081,600
Unix timestamp at the end-14,137,545,601
Years from now505 years ago
Days from today184,699 days since 1 January

The number 1521

As a number1,521
In wordsone thousand, five hundred and twenty-one
Roman numeralsMDXXI

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Neighbouring years

Also reads as

#115522 (colour)

  • #115522
  • Green
  • Dark
  • Nearest: Dark olivegreen

#115522 is a green with RGB values 17, 85, 34 and HSL 135°, 67%, 20%. It is a dark colour, so white text on it reaches 9:1 contrast (AAA for normal text). The nearest named colour is Dark olivegreen.

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Colour values

#115522#115522
HEX#115522
HEX (short)#152
RGBrgb(17, 85, 34)
RGB (0–1)0.0667, 0.3333, 0.1333
RGB percentages6.7%, 33.3%, 13.3%
HSLhsl(135, 66.7%, 20%)
HSV / HSBhsv(135, 80%, 33.3%)
CMYK80%, 0%, 60%, 66.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,135,906
CSS custom property--colour: #115522;

Brightness & contrast

Relative luminance0.06732WCAG 2.x, 0 is black and 1 is white
Perceived brightness66.8 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 8.95:1
Contrast with white8.95:1WCAG normal text: AAA
Contrast with black2.35:1WCAG normal text: Fail
Greyscale equivalent#434343
Inverted#EEAADD

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#564D1Dno red cones; affects about 1% of men; ΔE 30.4 from the original
Deuteranopia#4E4726no green cones; the most common form, about 1% of men; ΔE 30.7 from the original
Tritanopia#00534Ano blue cones; rare, and affects men and women equally; ΔE 26.1 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text8.95:1WCAG large text: AAA
Contrast with black, large text2.35:1WCAG large text: Fail

Named colours

Dark olivegreen · ΔE 19.2Dark green · ΔE 21.6Sea green · ΔE 21.8Forest green · ΔE 33.3Dark slate grey · ΔE 34.6Olivedrab · ΔE 35.4
Nearest named CSS colourDark olivegreen (#556B2F)ΔE 19.19, a distinctly different colour
Hue familygreen
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#551144
Analogous#225511, #115544
Triadic#221155, #552211
Split complementary#441155, #551122
Tetradic#112255, #551144, #554411

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#55DD77
Lighter +30%#2AD555
Lighter +20%#22AA44
Lighter +10%#198033
Darker −10%#092B11
Darker −20%#000000
Darker −30%#000000
Darker −40%#000000
More saturated +25%#04621C
Less saturated −25%#1E4828

Channel breakdown

R17
G85
B34
Red17 (6.7%)
Green85 (33.3%)
Blue34 (13.3%)
Hue135°
Saturation (HSL)66.67%
Lightness20%
Dominant channelGreen
Hex per channelR 11 · G 55 · B 22

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Every value on this page was computed from “1521” by Nerdulator’s number engine. Nothing here was retrieved from a database of answers or written by a model.