Number
131,721
- Positive
- Odd
- Composite
- 6 digits
131,721 is an odd 6-digit integer and a composite number. It has 12 divisors and a digital root of 6.
Number properties
ParityOddnot divisible by 2
SignPositive
PrimalityComposite
Absolute value131,721
Digit count6
Digit sum15
Digital root6repeated digit sum
PalindromicNoreads differently backwards
Happy numberNosquared-digit sums reach 1
Harshad numberNodivisible by its own digit sum
Factors & divisors
Prime factorisation3 × 23^2 × 83
Distinct prime factors33, 23, 83
Number of divisors12
Sum of divisors σ(n)185,808
Aliquot sum54,087sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)82,984integers below n that share no factor with it
SquarefreeNohas a repeated prime factor
All divisors1, 3, 23, 69, 83, 249, 529, 1,587, 1,909, 5,727, 43,907, 131,72112 in total
Arithmetic
Representations
Decimal131,721
Binary10000000101000100118 bits
Octal401211
Hexadecimal20289
Base 362TMX
Roman numeralNot defined above 3,999there is no agreed standard notation
In wordsone hundred and thirty-one thousand, seven hundred and twenty-one
Ordinalone hundred and thirty-one thousand, seven hundred and twenty-first
Scientific notation1.31721 × 10^5
Engineering notation131.721 × 10^3
Nearest landmarks
Powers & multiples
131,721 to the power 217,350,421,841
131,721 to the power 32,285,414,915,318,361
131,721 to the power 4301,037,138,060,649,829,281
131,721 to the power 539,652,912,862,486,856,162,722,601
First ten multiples131,721, 263,442, 395,163, 526,884, 658,605, 790,326, 922,047, 1,053,768, 1,185,489, 1,317,210
Powers of twoBetween 2^17 (131,072) and 2^18 (262,144)
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 9No, remainder 6
Divisible by 10No, remainder 1
Divisible by 11No, remainder 7
Divisible by 12No, remainder 9
Divisible by 100No, remainder 21
Collatz (3n + 1) trajectory
Steps to reach 1100the total stopping time
Highest value reached1,125,3048× the starting value
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps131,721 → 395,164 → 197,582 → 98,791 → 296,374 → 148,187 → 444,562 → 222,281 → 666,844 → 333,422 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage13,172,100%
131,721% as a decimal1,317.21
131,721% of 100131,721
131,721% of 1,0001,317,210
As a fraction of 100131,721/100
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Derived from 131,721
Also reads as
#131721 (colour)
- #131721
- Blue
- Dark
- Nearest: Black
#131721 is a blue with RGB values 19, 23, 33 and HSL 223°, 27%, 10%. It is a dark colour, so white text on it reaches 17.9:1 contrast (AAA for normal text). The nearest named colour is Black.
Colour values
#131721#131721
HEX#131721
RGBrgb(19, 23, 33)
RGB (0–1)0.0745, 0.0902, 0.1294
RGB percentages7.5%, 9%, 12.9%
HSLhsl(222.9, 26.9%, 10.2%)
HSV / HSBhsv(222.9, 42.4%, 12.9%)
CMYK42.4%, 30.3%, 0%, 87.1%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,251,105
CSS custom property--colour: #131721;
Brightness & contrast
Relative luminance0.00861WCAG 2.x, 0 is black and 1 is white
Perceived brightness23.3 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 17.91:1
Contrast with white17.91:1WCAG normal text: AAA
Contrast with black1.17:1WCAG normal text: Fail
Greyscale equivalent#171717
Inverted#ECE8DE
Colour vision & accessibility
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text17.91:1WCAG large text: AAA
Contrast with black, large text1.17:1WCAG large text: Fail
Named colours
Hue familyblue
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#211D13
Analogous#131E21, #161321
Triadic#211317, #172113
Split complementary#211613, #1E2113
Tetradic#21131E, #211D13, #132116
Tints, shades & saturation
Channel breakdown
R19
G23
B33
Red19 (7.5%)
Green23 (9%)
Blue33 (12.9%)
Hue222.86°
Saturation (HSL)26.92%
Lightness10.2%
Dominant channelBlue
Hex per channelR 13 · G 17 · B 21
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Harmonies
Similar named colours
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