Number
133
- Positive
- Odd
- Composite
- 3 digits
133 is an odd 3-digit integer and a composite number. It has 4 divisors and a digital root of 7.
The canonical address for this page is /133.
Number properties
ParityOddnot divisible by 2
SignPositive
PrimalityComposite
Absolute value133
Digit count3
Digit sum7
Digital root7repeated digit sum
PalindromicNoreads differently backwards
Happy numberYessquared-digit sums reach 1
Harshad numberYesdivisible by its own digit sum
Factors & divisors
Prime factorisation7 × 19
Distinct prime factors27, 19
Number of divisors4
Sum of divisors σ(n)160
Aliquot sum27sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)108integers below n that share no factor with it
SquarefreeYesno repeated prime factor
All divisors1, 7, 19, 1334 in total
Arithmetic
Representations
Decimal133
Binary100001018 bits
Octal205
Hexadecimal85
Base 363P
Roman numeralCXXXIII
In wordsone hundred and thirty-three
Ordinalone hundred and thirty-third
Scientific notation1.33 × 10^2
Engineering notation133
Nearest landmarks
Powers & multiples
133 to the power 217,689
133 to the power 32,352,637
133 to the power 4312,900,721
133 to the power 541,615,795,893
First ten multiples133, 266, 399, 532, 665, 798, 931, 1,064, 1,197, 1,330
Powers of twoBetween 2^7 (128) and 2^8 (256)
Divisibility tests
Divisible by 2No, remainder 1
Divisible by 3No, remainder 1
Divisible by 4No, remainder 1
Divisible by 5No, remainder 3
Divisible by 6No, remainder 1
Divisible by 7Yes
Divisible by 8No, remainder 5
Divisible by 9No, remainder 7
Divisible by 10No, remainder 3
Divisible by 11No, remainder 1
Divisible by 12No, remainder 1
Divisible by 100No, remainder 33
Collatz (3n + 1) trajectory
Steps to reach 128the total stopping time
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps133 → 400 → 200 → 100 → 50 → 25 → 76 → 38 → 19 → 58 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage13,300%
133% as a decimal1.33
133% of 100133
133% of 1,0001,330
As a fraction of 100133/100
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Derived from 133
Other readings
Also reads as
#000133 (colour)
- #000133
- Blue
- Dark
- Nearest: Midnight blue
#000133 is a blue with RGB values 0, 1, 51 and HSL 239°, 100%, 10%. It is a dark colour, so white text on it reaches 20:1 contrast (AAA for normal text). The nearest named colour is Midnight blue.
Colour values
#000133#000133
HEX#000133
RGBrgb(0, 1, 51)
RGB (0–1)0, 0.0039, 0.2
RGB percentages0%, 0.4%, 20%
HSLhsl(238.8, 100%, 10%)
HSV / HSBhsv(238.8, 100%, 20%)
CMYK100%, 98%, 0%, 80%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer307
CSS custom property--colour: #000133;
Brightness & contrast
Relative luminance0.00261WCAG 2.x, 0 is black and 1 is white
Perceived brightness17.2 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 19.96:1
Contrast with white19.96:1WCAG normal text: AAA
Contrast with black1.05:1WCAG normal text: Fail
Greyscale equivalent#040404
Inverted#FFFECC
Colour vision & accessibility
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text19.96:1WCAG large text: AAA
Contrast with black, large text1.05:1WCAG large text: Fail
Named colours
Hue familyblue
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#333200
Analogous#001B33, #180033
Triadic#330001, #013300
Split complementary#331800, #1B3300
Tetradic#33001B, #333200, #003318
Tints, shades & saturation
Channel breakdown
R0
G1
B51
Red0 (0%)
Green1 (0.4%)
Blue51 (20%)
Hue238.82°
Saturation (HSL)100%
Lightness10%
Dominant channelBlue
Hex per channelR 00 · G 01 · B 33
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Harmonies
Similar named colours
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