Number
125
- Positive
- Odd
- Composite
- Perfect cube
- 3 digits
125 is an odd 3-digit integer and a composite number. It has 4 divisors and a digital root of 8.
Number properties
ParityOddnot divisible by 2
SignPositive
PrimalityComposite
Absolute value125
Digit count3
Digit sum8
Digital root8repeated digit sum
PalindromicNoreads differently backwards
Perfect cubeYes, 5³
Happy numberNosquared-digit sums reach 1
Harshad numberNodivisible by its own digit sum
Factors & divisors
Prime factorisation5^3
Distinct prime factors15
Number of divisors4
Sum of divisors σ(n)156
Aliquot sum31sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)100integers below n that share no factor with it
SquarefreeNohas a repeated prime factor
All divisors1, 5, 25, 1254 in total
Arithmetic
Representations
Decimal125
Binary11111017 bits
Octal175
Hexadecimal7D
Base 363H
Roman numeralCXXV
In wordsone hundred and twenty-five
Ordinalone hundred and twenty-fifth
Scientific notation1.25 × 10^2
Engineering notation125
Nearest landmarks
Powers & multiples
125 to the power 215,625
125 to the power 31,953,125
125 to the power 4244,140,625
125 to the power 530,517,578,125
First ten multiples125, 250, 375, 500, 625, 750, 875, 1,000, 1,125, 1,250
Powers of twoBetween 2^6 (64) and 2^7 (128)
Divisibility tests
Divisible by 2No, remainder 1
Divisible by 3No, remainder 2
Divisible by 4No, remainder 1
Divisible by 5Yes
Divisible by 6No, remainder 5
Divisible by 7No, remainder 6
Divisible by 8No, remainder 5
Divisible by 9No, remainder 8
Divisible by 10No, remainder 5
Divisible by 11No, remainder 4
Divisible by 12No, remainder 5
Divisible by 100No, remainder 25
Collatz (3n + 1) trajectory
Steps to reach 1108the total stopping time
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps125 → 376 → 188 → 94 → 47 → 142 → 71 → 214 → 107 → 322 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage12,500%
125% as a decimal1.25
125% of 100125
125% of 1,0001,250
As a fraction of 100125/100
Read another way
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Derived from 125
Other readings
Also reads as
#112255 (colour)
- #112255
- Blue
- Dark
- Nearest: Dark slateblue
#112255 is a blue with RGB values 17, 34, 85 and HSL 225°, 67%, 20%. It is a dark colour, so white text on it reaches 15.2:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.
Colour values
#112255#112255
HEX#112255
HEX (short)#125
RGBrgb(17, 34, 85)
RGB (0–1)0.0667, 0.1333, 0.3333
RGB percentages6.7%, 13.3%, 33.3%
HSLhsl(225, 66.7%, 20%)
HSV / HSBhsv(225, 80%, 33.3%)
CMYK80%, 60%, 0%, 66.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,122,901
CSS custom property--colour: #112255;
Brightness & contrast
Relative luminance0.01919WCAG 2.x, 0 is black and 1 is white
Perceived brightness39.9 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 15.18:1
Contrast with white15.18:1WCAG normal text: AAA
Contrast with black1.38:1WCAG normal text: Fail
Greyscale equivalent#222222
Inverted#EEDDAA
Colour vision & accessibility
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text15.18:1WCAG large text: AAA
Contrast with black, large text1.38:1WCAG large text: Fail
Named colours
Hue familyblue
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#554411
Analogous#114455, #221155
Triadic#551122, #225511
Split complementary#552211, #445511
Tetradic#551144, #554411, #115522
Tints, shades & saturation
Channel breakdown
R17
G34
B85
Red17 (6.7%)
Green34 (13.3%)
Blue85 (33.3%)
Hue225°
Saturation (HSL)66.67%
Lightness20%
Dominant channelBlue
Hex per channelR 11 · G 22 · B 55
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Harmonies
Similar named colours
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