Number
159
- Positive
- Odd
- Composite
- 3 digits
159 is an odd 3-digit integer and a composite number. It has 4 divisors and a digital root of 6.
Number properties
ParityOddnot divisible by 2
SignPositive
PrimalityComposite
Absolute value159
Digit count3
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 × 53
Distinct prime factors23, 53
Number of divisors4
Sum of divisors σ(n)216
Aliquot sum57sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)104integers below n that share no factor with it
SquarefreeYesno repeated prime factor
All divisors1, 3, 53, 1594 in total
Arithmetic
Representations
Decimal159
Binary100111118 bits
Octal237
Hexadecimal9F
Base 364F
Roman numeralCLIX
In wordsone hundred and fifty-nine
Ordinalone hundred and fifty-ninth
Scientific notation1.59 × 10^2
Engineering notation159
Nearest landmarks
Powers & multiples
159 to the power 225,281
159 to the power 34,019,679
159 to the power 4639,128,961
159 to the power 5101,621,504,799
First ten multiples159, 318, 477, 636, 795, 954, 1,113, 1,272, 1,431, 1,590
Powers of twoBetween 2^7 (128) and 2^8 (256)
Divisibility tests
Divisible by 2No, remainder 1
Divisible by 3Yes
Divisible by 4No, remainder 3
Divisible by 5No, remainder 4
Divisible by 6No, remainder 3
Divisible by 7No, remainder 5
Divisible by 8No, remainder 7
Divisible by 9No, remainder 6
Divisible by 10No, remainder 9
Divisible by 11No, remainder 5
Divisible by 12No, remainder 3
Divisible by 100No, remainder 59
Collatz (3n + 1) trajectory
Steps to reach 154the total stopping time
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps159 → 478 → 239 → 718 → 359 → 1,078 → 539 → 1,618 → 809 → 2,428 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage15,900%
159% as a decimal1.59
159% of 100159
159% of 1,0001,590
As a fraction of 100159/100
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Derived from 159
Other readings
Also reads as
#115599 (colour)
- #115599
- Blue
- Dark
- Nearest: Dark slateblue
#115599 is a blue with RGB values 17, 85, 153 and HSL 210°, 80%, 33%. It is a dark colour, so white text on it reaches 7.5:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.
Colour values
#115599#115599
HEX#115599
HEX (short)#159
RGBrgb(17, 85, 153)
RGB (0–1)0.0667, 0.3333, 0.6
RGB percentages6.7%, 33.3%, 60%
HSLhsl(210, 80%, 33.3%)
HSV / HSBhsv(210, 88.9%, 60%)
CMYK88.9%, 44.4%, 0%, 40%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,136,025
CSS custom property--colour: #115599;
Brightness & contrast
Relative luminance0.08916WCAG 2.x, 0 is black and 1 is white
Perceived brightness83.6 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 7.55:1
Contrast with white7.55:1WCAG normal text: AAA
Contrast with black2.78:1WCAG normal text: Fail
Greyscale equivalent#4B4B4B
Inverted#EEAA66
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text7.55:1WCAG large text: AAA
Contrast with black, large text2.78:1WCAG large text: Fail
Named colours
Hue familyblue
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#995511
Analogous#119999, #111199
Triadic#991155, #559911
Split complementary#991111, #999911
Tetradic#991199, #995511, #119911
Tints, shades & saturation
Channel breakdown
R17
G85
B153
Red17 (6.7%)
Green85 (33.3%)
Blue153 (60%)
Hue210°
Saturation (HSL)80%
Lightness33.33%
Dominant channelBlue
Hex per channelR 11 · G 55 · B 99
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Harmonies
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