Number
881
- Positive
- Odd
- Prime
- 3 digits
881 is an odd 3-digit integer and a prime number. It has 2 divisors and a digital root of 8.
Number properties
ParityOddnot divisible by 2
SignPositive
PrimalityPrime
Absolute value881
Digit count3
Digit sum17
Digital root8repeated digit sum
PalindromicNoreads differently backwards
Happy numberYessquared-digit sums reach 1
Harshad numberNodivisible by its own digit sum
Factors & divisors
Prime factorisation881
Distinct prime factors1881
Number of divisors2
Sum of divisors σ(n)882
Aliquot sum1sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)880integers below n that share no factor with it
SquarefreeYesno repeated prime factor
All divisors1, 8812 in total
Arithmetic
Representations
Decimal881
Binary110111000110 bits
Octal1561
Hexadecimal371
Base 36OH
Roman numeralDCCCLXXXI
In wordseight hundred and eighty-one
Ordinaleight hundred and eighty-first
Scientific notation8.81 × 10^2
Engineering notation881
Nearest landmarks
Powers & multiples
881 to the power 2776,161
881 to the power 3683,797,841
881 to the power 4602,425,897,921
881 to the power 5530,737,216,068,401
First ten multiples881, 1,762, 2,643, 3,524, 4,405, 5,286, 6,167, 7,048, 7,929, 8,810
Powers of twoBetween 2^9 (512) and 2^10 (1,024)
Divisibility tests
Divisible by 2No, remainder 1
Divisible by 3No, remainder 2
Divisible by 4No, remainder 1
Divisible by 5No, remainder 1
Divisible by 6No, remainder 5
Divisible by 7No, remainder 6
Divisible by 8No, remainder 1
Divisible by 9No, remainder 8
Divisible by 10No, remainder 1
Divisible by 11No, remainder 1
Divisible by 12No, remainder 5
Divisible by 100No, remainder 81
Collatz (3n + 1) trajectory
Steps to reach 1116the total stopping time
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps881 → 2,644 → 1,322 → 661 → 1,984 → 992 → 496 → 248 → 124 → 62 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage88,100%
881% as a decimal8.81
881% of 100881
881% of 1,0008,810
As a fraction of 100881/100
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Derived from 881
Other readings
Also reads as
#888811 (colour)
- #888811
- Yellow
- Dark
- Nearest: Olive
#888811 is a yellow with RGB values 136, 136, 17 and HSL 60°, 78%, 30%. It is a dark colour, so black text on it reaches 5.6:1 contrast (AA for normal text). The nearest named colour is Olive.
Colour values
#888811#888811
HEX#888811
HEX (short)#881
RGBrgb(136, 136, 17)
RGB (0–1)0.5333, 0.5333, 0.0667
RGB percentages53.3%, 53.3%, 6.7%
HSLhsl(60, 77.8%, 30%)
HSV / HSBhsv(60, 87.5%, 53.3%)
CMYK0%, 0%, 87.5%, 46.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer8,947,729
CSS custom property--colour: #888811;
Brightness & contrast
Relative luminance0.22883WCAG 2.x, 0 is black and 1 is white
Perceived brightness128.1 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 5.58:1
Contrast with white3.77:1WCAG normal text: Fail
Contrast with black5.58:1WCAG normal text: AA
Greyscale equivalent#7F7F7F
Inverted#7777EE
Colour vision & accessibility
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text3.77:1WCAG large text: AA
Contrast with black, large text5.58:1WCAG large text: AAA
Named colours
Hue familyyellow
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#111188
Analogous#884D11, #4D8811
Triadic#118888, #881188
Split complementary#114D88, #4D1188
Tetradic#11884D, #111188, #88114D
Tints, shades & saturation
Channel breakdown
R136
G136
B17
Red136 (53.3%)
Green136 (53.3%)
Blue17 (6.7%)
Hue60°
Saturation (HSL)77.78%
Lightness30%
Dominant channelRed and Green
Hex per channelR 88 · G 88 · B 11
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Harmonies
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