Number
135
- Positive
- Odd
- Composite
- 3 digits
135 is an odd 3-digit integer and a composite number. It has 8 divisors and a digital root of 9.
Number properties
ParityOddnot divisible by 2
SignPositive
PrimalityComposite
Absolute value135
Digit count3
Digit sum9
Digital root9repeated digit sum
PalindromicNoreads differently backwards
Happy numberNosquared-digit sums reach 1
Harshad numberYesdivisible by its own digit sum
Factors & divisors
Prime factorisation3^3 × 5
Distinct prime factors23, 5
Number of divisors8
Sum of divisors σ(n)240
Aliquot sum105sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)72integers below n that share no factor with it
SquarefreeNohas a repeated prime factor
All divisors1, 3, 5, 9, 15, 27, 45, 1358 in total
Arithmetic
Representations
Decimal135
Binary100001118 bits
Octal207
Hexadecimal87
Base 363R
Roman numeralCXXXV
In wordsone hundred and thirty-five
Ordinalone hundred and thirty-fifth
Scientific notation1.35 × 10^2
Engineering notation135
Nearest landmarks
Powers & multiples
135 to the power 218,225
135 to the power 32,460,375
135 to the power 4332,150,625
135 to the power 544,840,334,375
First ten multiples135, 270, 405, 540, 675, 810, 945, 1,080, 1,215, 1,350
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 5Yes
Divisible by 6No, remainder 3
Divisible by 7No, remainder 2
Divisible by 8No, remainder 7
Divisible by 9Yes
Divisible by 10No, remainder 5
Divisible by 11No, remainder 3
Divisible by 12No, remainder 3
Divisible by 100No, remainder 35
Collatz (3n + 1) trajectory
Steps to reach 141the total stopping time
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps135 → 406 → 203 → 610 → 305 → 916 → 458 → 229 → 688 → 344 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage13,500%
135% as a decimal1.35
135% of 100135
135% of 1,0001,350
As a fraction of 100135/100
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Derived from 135
Other readings
Also reads as
#113355 (colour)
- #113355
- Blue
- Dark
- Nearest: Dark slate grey
#113355 is a blue with RGB values 17, 51, 85 and HSL 210°, 67%, 20%. It is a dark colour, so white text on it reaches 12.9:1 contrast (AAA for normal text). The nearest named colour is Dark slate grey.
Colour values
#113355#113355
HEX#113355
HEX (short)#135
RGBrgb(17, 51, 85)
RGB (0–1)0.0667, 0.2, 0.3333
RGB percentages6.7%, 20%, 33.3%
HSLhsl(210, 66.7%, 20%)
HSV / HSBhsv(210, 80%, 33.3%)
CMYK80%, 40%, 0%, 66.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,127,253
CSS custom property--colour: #113355;
Brightness & contrast
Relative luminance0.03143WCAG 2.x, 0 is black and 1 is white
Perceived brightness49.4 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 12.89:1
Contrast with white12.89:1WCAG normal text: AAA
Contrast with black1.63:1WCAG normal text: Fail
Greyscale equivalent#2E2E2E
Inverted#EECCAA
Colour vision & accessibility
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text12.89:1WCAG large text: AAA
Contrast with black, large text1.63:1WCAG large text: Fail
Named colours
Hue familyblue
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#553311
Analogous#115555, #111155
Triadic#551133, #335511
Split complementary#551111, #555511
Tetradic#551155, #553311, #115511
Tints, shades & saturation
Channel breakdown
R17
G51
B85
Red17 (6.7%)
Green51 (20%)
Blue85 (33.3%)
Hue210°
Saturation (HSL)66.67%
Lightness20%
Dominant channelBlue
Hex per channelR 11 · G 33 · B 55
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Harmonies
Similar named colours
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