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Number

1,331

  • Positive
  • Odd
  • Composite
  • Perfect cube
  • 4 digits

1,331 is an odd 4-digit integer and a composite number. It has 4 divisors and a digital root of 8.

Number properties

ParityOddnot divisible by 2
SignPositive
PrimalityComposite
Absolute value1,331
Digit count4
Digit sum8
Digital root8repeated digit sum
PalindromicYesreads the same backwards
Perfect cubeYes, 11³
Happy numberNosquared-digit sums reach 1
Harshad numberNodivisible by its own digit sum

Factors & divisors

Prime factorisation11^3
Distinct prime factors111
Number of divisors4
Sum of divisors σ(n)1,464
Aliquot sum133sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)1,210integers below n that share no factor with it
SquarefreeNohas a repeated prime factor
All divisors1, 11, 121, 1,3314 in total

Arithmetic

Previous number1,330
Next number1,332
Double2,662
Half665.5
Square1,771,561
Cube2,357,947,691
Square root36.482872694≈irrational, shown to 9 decimal places
Cube root11
Negation-1,331
Reciprocal0.0007513148≈

Representations

Decimal1,331
Binary1010011001111 bits
Octal2463
Hexadecimal533
Base 3610Z
Roman numeralMCCCXXXI
In wordsone thousand, three hundred and thirty-one
Ordinalone thousand, three hundred and thirty-first
Scientific notation1.331 × 10^3
Engineering notation1.331 × 10^3

Nearest landmarks

Next prime1,361+30
Previous prime1,327−4
Distance to nearest prime4
Nearest square below1,296
Nearest square above1,369

Powers & multiples

1,331 to the power 21,771,561
1,331 to the power 32,357,947,691
1,331 to the power 43,138,428,376,721
1,331 to the power 54,177,248,169,415,651
First ten multiples1,331, 2,662, 3,993, 5,324, 6,655, 7,986, 9,317, 10,648, 11,979, 13,310
Powers of twoBetween 2^10 (1,024) and 2^11 (2,048)

Divisibility tests

Divisible by 2No, remainder 1
Divisible by 3No, remainder 2
Divisible by 4No, remainder 3
Divisible by 5No, remainder 1
Divisible by 6No, remainder 5
Divisible by 7No, remainder 1
Divisible by 8No, remainder 3
Divisible by 9No, remainder 8
Divisible by 10No, remainder 1
Divisible by 11Yes
Divisible by 12No, remainder 11
Divisible by 100No, remainder 31

Collatz (3n + 1) trajectory

Steps to reach 152the total stopping time
Highest value reached5,9924× the starting value
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps1,331 → 3,994 → 1,997 → 5,992 → 2,996 → 1,498 → 749 → 2,248 → 1,124 → 562 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1

As a percentage & fraction

As a percentage133,100%
1,331% as a decimal13.31
1,331% of 1001,331
1,331% of 1,00013,310
As a fraction of 1001,331/100

Read another way

As seconds22 minutes and 11 seconds
As bytes1.3 KiB
As a year1331 AD
As a 24-bit colour#000533

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Neighbouring numbers

Nearby primes

Also reads as

1331 (year)

  • Common year
  • 365 days
  • 14th century
  • Goat

1331 was a common year of 365 days. It began on a Monday and ended on a Monday. Easter Sunday fell on 1 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 aMonday
31 December fell on aMonday
Century14th century
Decade1330s
Chinese zodiacGoat
Easter Sunday1 April

Months of 1331

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

Time references

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

Unix timestamp at the start-20,164,896,000
Unix timestamp at the end-20,133,360,001
Years from now695 years ago
Days from today254,095 days since 1 January

The number 1331

As a number1,331
In wordsone thousand, three hundred and thirty-one
Roman numeralsMCCCXXXI

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Neighbouring years

Also reads as

#113333 (colour)

  • #113333
  • Cyan
  • Dark
  • Nearest: Dark slate grey

#113333 is a cyan with RGB values 17, 51, 51 and HSL 180°, 50%, 13%. It is a dark colour, so white text on it reaches 13.6:1 contrast (AAA for normal text). The nearest named colour is Dark slate grey.

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Colour values

#113333#113333
HEX#113333
HEX (short)#133
RGBrgb(17, 51, 51)
RGB (0–1)0.0667, 0.2, 0.2
RGB percentages6.7%, 20%, 20%
HSLhsl(180, 50%, 13.3%)
HSV / HSBhsv(180, 66.7%, 20%)
CMYK66.7%, 0%, 0%, 80%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,127,219
CSS custom property--colour: #113333;

Brightness & contrast

Relative luminance0.02726WCAG 2.x, 0 is black and 1 is white
Perceived brightness43.7 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 13.59:1
Contrast with white13.59:1WCAG normal text: AAA
Contrast with black1.55:1WCAG normal text: Fail
Greyscale equivalent#2C2C2C
Inverted#EECCCC

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#2F3033no red cones; affects about 1% of men; ΔE 12.6 from the original
Deuteranopia#2A2C33no green cones; the most common form, about 1% of men; ΔE 13.2 from the original
Tritanopia#003533no blue cones; rare, and affects men and women equally; ΔE 4.4 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text13.59:1WCAG large text: AAA
Contrast with black, large text1.55:1WCAG large text: Fail

Named colours

Dark slate grey · ΔE 12.4Black · ΔE 22.8Dim grey · ΔE 28.5Teal · ΔE 34.1Slate grey · ΔE 36Gray · ΔE 36.9
Nearest named CSS colourDark slate grey (#2F4F4F)ΔE 12.35, a distinctly different colour
Hue familycyan
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#331111
Analogous#113322, #112233
Triadic#331133, #333311
Split complementary#331122, #332211
Tetradic#221133, #331111, #223311

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#4CC4C4
Lighter +30%#37A6A6
Lighter +20%#2A8080
Lighter +10%#1E5959
Darker −10%#040D0D
Darker −20%#000000
Darker −30%#000000
Darker −40%#000000
More saturated +25%#083C3C
Less saturated −25%#192B2B

Channel breakdown

R17
G51
B51
Red17 (6.7%)
Green51 (20%)
Blue51 (20%)
Hue180°
Saturation (HSL)50%
Lightness13.33%
Dominant channelGreen and Blue
Hex per channelR 11 · G 33 · B 33

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Every value on this page was computed from “1331” by Nerdulator’s number engine. Nothing here was retrieved from a database of answers or written by a model.