Number
131,729
- Positive
- Odd
- Composite
- 6 digits
131,729 is an odd 6-digit integer and a composite number. It has 4 divisors and a digital root of 5.
Number properties
ParityOddnot divisible by 2
SignPositive
PrimalityComposite
Absolute value131,729
Digit count6
Digit sum23
Digital root5repeated digit sum
PalindromicNoreads differently backwards
Happy numberNosquared-digit sums reach 1
Harshad numberNodivisible by its own digit sum
Factors & divisors
Prime factorisation13 × 10,133
Distinct prime factors213, 10,133
Number of divisors4
Sum of divisors σ(n)141,876
Aliquot sum10,147sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)121,584integers below n that share no factor with it
SquarefreeYesno repeated prime factor
All divisors1, 13, 10,133, 131,7294 in total
Arithmetic
Representations
Decimal131,729
Binary10000000101001000118 bits
Octal401221
Hexadecimal20291
Base 362TN5
Roman numeralNot defined above 3,999there is no agreed standard notation
In wordsone hundred and thirty-one thousand, seven hundred and twenty-nine
Ordinalone hundred and thirty-one thousand, seven hundred and twenty-ninth
Scientific notation1.31729 × 10^5
Engineering notation131.729 × 10^3
Nearest landmarks
Powers & multiples
131,729 to the power 217,352,529,441
131,729 to the power 32,285,831,350,733,489
131,729 to the power 4301,110,278,000,771,772,481
131,729 to the power 539,664,955,810,763,664,817,149,649
First ten multiples131,729, 263,458, 395,187, 526,916, 658,645, 790,374, 922,103, 1,053,832, 1,185,561, 1,317,290
Powers of twoBetween 2^17 (131,072) and 2^18 (262,144)
Divisibility tests
Divisible by 2No, remainder 1
Divisible by 3No, remainder 2
Divisible by 4No, remainder 1
Divisible by 5No, remainder 4
Divisible by 6No, remainder 5
Divisible by 7No, remainder 3
Divisible by 8No, remainder 1
Divisible by 9No, remainder 5
Divisible by 10No, remainder 9
Divisible by 11No, remainder 4
Divisible by 12No, remainder 5
Divisible by 100No, remainder 29
Collatz (3n + 1) trajectory
Steps to reach 1149the total stopping time
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps131,729 → 395,188 → 197,594 → 98,797 → 296,392 → 148,196 → 74,098 → 37,049 → 111,148 → 55,574 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage13,172,900%
131,729% as a decimal1,317.29
131,729% of 100131,729
131,729% of 1,0001,317,290
As a fraction of 100131,729/100
Read another way
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Derived from 131,729
Also reads as
#131729 (colour)
- #131729
- Blue
- Dark
- Nearest: Black
#131729 is a blue with RGB values 19, 23, 41 and HSL 229°, 37%, 12%. It is a dark colour, so white text on it reaches 17.8:1 contrast (AAA for normal text). The nearest named colour is Black.
Colour values
#131729#131729
HEX#131729
RGBrgb(19, 23, 41)
RGB (0–1)0.0745, 0.0902, 0.1608
RGB percentages7.5%, 9%, 16.1%
HSLhsl(229.1, 36.7%, 11.8%)
HSV / HSBhsv(229.1, 53.7%, 16.1%)
CMYK53.7%, 43.9%, 0%, 83.9%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,251,113
CSS custom property--colour: #131729;
Brightness & contrast
Relative luminance0.00911WCAG 2.x, 0 is black and 1 is white
Perceived brightness24.7 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 17.76:1
Contrast with white17.76:1WCAG normal text: AAA
Contrast with black1.18:1WCAG normal text: Fail
Greyscale equivalent#171717
Inverted#ECE8D6
Colour vision & accessibility
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text17.76:1WCAG large text: AAA
Contrast with black, large text1.18:1WCAG large text: Fail
Named colours
Hue familyblue
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#292513
Analogous#132229, #1A1329
Triadic#291317, #172913
Split complementary#291A13, #222913
Tetradic#291322, #292513, #13291A
Tints, shades & saturation
Channel breakdown
R19
G23
B41
Red19 (7.5%)
Green23 (9%)
Blue41 (16.1%)
Hue229.09°
Saturation (HSL)36.67%
Lightness11.76%
Dominant channelBlue
Hex per channelR 13 · G 17 · B 29
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Harmonies
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