Number

871

Positive
Odd
Composite
3 digits

871 is an odd 3-digit integer and a composite number. It has 4 divisors and a digital root of 7.

Number properties

ParityOddnot divisible by 2

SignPositive

PrimalityComposite

Absolute value871

Digit count3

Digit sum16

Digital root7repeated digit sum

PalindromicNoreads differently backwards

Happy numberNosquared-digit sums reach 1

Harshad numberNodivisible by its own digit sum

Factors & divisors

Prime factorisation13 × 67

Distinct prime factors213, 67

Number of divisors4

Sum of divisors σ(n)952

Aliquot sum81sum of the proper divisors

ClassificationDeficientthe aliquot sum is less than the number

Euler's totient φ(n)792integers below n that share no factor with it

SquarefreeYesno repeated prime factor

All divisors1, 13, 67, 8714 in total

Arithmetic

Previous number870

Next number872

Double1,742

Half435.5

Square758,641

Cube660,776,311

Square root29.512709127≈irrational, shown to 9 decimal places

Cube root9.550058934≈

Negation-871

Reciprocal0.0011481056≈

871 factorial2261829358749454697485698663951591597808… (2,185 digits)

Representations

Decimal871

Binary110110011110 bits

Octal1547

Hexadecimal367

Base 36O7

Roman numeralDCCCLXXI

In wordseight hundred and seventy-one

Ordinaleight hundred and seventy-first

Scientific notation8.71 × 10^2

Engineering notation871

Nearest landmarks

Next prime877+6

Previous prime863−8

Distance to nearest prime6

Nearest square below841

Nearest square above900

Powers & multiples

871 to the power 2758,641

871 to the power 3660,776,311

871 to the power 4575,536,166,881

871 to the power 5501,292,001,353,351

First ten multiples871, 1,742, 2,613, 3,484, 4,355, 5,226, 6,097, 6,968, 7,839, 8,710

Powers of twoBetween 2^9 (512) and 2^10 (1,024)

Divisibility tests

Divisible by 2No, remainder 1

Divisible by 3No, remainder 1

Divisible by 4No, remainder 3

Divisible by 5No, remainder 1

Divisible by 6No, remainder 1

Divisible by 7No, remainder 3

Divisible by 8No, remainder 7

Divisible by 9No, remainder 7

Divisible by 10No, remainder 1

Divisible by 11No, remainder 2

Divisible by 12No, remainder 7

Divisible by 100No, remainder 71

Collatz (3n + 1) trajectory

Steps to reach 1178the total stopping time

Highest value reached190,996219× the starting value

Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven

First steps871 → 2,614 → 1,307 → 3,922 → 1,961 → 5,884 → 2,942 → 1,471 → 4,414 → 2,207 → …

Last steps… → 5 → 16 → 8 → 4 → 2 → 1

As a percentage & fraction

As a percentage87,100%

871% as a decimal8.71

871% of 100871

871% of 1,0008,710

As a fraction of 100871/100

Read another way

As seconds14 minutes and 31 seconds

As bytes871 B

As a 24-bit colour#000367

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Every link below is a page Nerdulator can generate from what it already knows about this value.

Neighbouring numbers

Derived from 871

Nearby primes

#887711 (colour)

#887711
Yellow
Dark
Nearest: Olive

#887711 is a yellow with RGB values 136, 119, 17 and HSL 51°, 78%, 30%. It is a dark colour, so black text on it reaches 4.7:1 contrast (AA for normal text). The nearest named colour is Olive.

Open this reading on its own page →

Colour values

#887711#887711

HEX#887711

HEX (short)#871

RGBrgb(136, 119, 17)

RGB (0–1)0.5333, 0.4667, 0.0667

RGB percentages53.3%, 46.7%, 6.7%

HSLhsl(51.4, 77.8%, 30%)

HSV / HSBhsv(51.4, 87.5%, 53.3%)

CMYK0%, 12.5%, 87.5%, 46.7%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer8,943,377

CSS custom property--colour: #887711;

Brightness & contrast

Relative luminance0.18468WCAG 2.x, 0 is black and 1 is white

Perceived brightness117.8 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 4.69:1

Contrast with white4.47:1WCAG normal text: Fail

Contrast with black4.69:1WCAG normal text: AA

Greyscale equivalent#737373

Inverted#7788EE

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#847400no red cones; affects about 1% of men; ΔE 2.8 from the original

Deuteranopia#887A1Ano green cones; the most common form, about 1% of men; ΔE 2.5 from the original

Tritanopia#946D65no blue cones; rare, and affects men and women equally; ΔE 45.4 from the original

Distinguishable without hueYesnever rely on hue alone to carry meaning

Contrast with white, large text4.47:1WCAG large text: AA

Contrast with black, large text4.69:1WCAG large text: AAA

Named colours

Olive · ΔE 10.3 Dark goldenrod · ΔE 19.6 Olivedrab · ΔE 24.9 Dark khaki · ΔE 27.1 Dark olivegreen · ΔE 27.4 Peru · ΔE 28.1

Nearest named CSS colourOlive (#808000)ΔE 10.31, a distinctly different colour

Hue familyyellow

CSS keyword usableNo exact keyword

Colour harmonies

base +30°+90°+120°+180°+210°+240°+270°+330°

Complementary#112288

Analogous#883C11, #5D8811

Triadic#118877, #771188

Split complementary#115D88, #3C1188

Tetradic#11883C, #112288, #88115D

Tints, shades & saturation

+40%+30%+20%+10%base -10%-20%-30%-40%

Lighter +40%#EEDD77

Lighter +30%#E8D24A

Lighter +20%#E3C61C

Lighter +10%#B59F17

Darker −10%#5B4F0B

Darker −20%#2D2806

Darker −30%#000000

Darker −40%#000000

More saturated +25%#998300

Less saturated −25%#756924

Channel breakdown

R136

G119

B17

Red136 (53.3%)

Green119 (46.7%)

Blue17 (6.7%)

Hue51.43°

Saturation (HSL)77.78%

Lightness30%

Dominant channelRed

Hex per channelR 88 · G 77 · B 11

Keep nerding

Every link below is a page Nerdulator can generate from what it already knows about this value.

871

Number properties

Factors & divisors

Arithmetic

Representations

Nearest landmarks

Powers & multiples

Divisibility tests

Collatz (3n + 1) trajectory

As a percentage & fraction

Read another way

Keep nerding

Neighbouring numbers

Derived from 871

Nearby primes

Other readings

#887711 (colour)

Colour values

Brightness & contrast

Colour vision & accessibility

Named colours

Colour harmonies

Tints, shades & saturation

Channel breakdown

Keep nerding

Harmonies

Lighter and darker

Similar named colours

Nerdulate something else