Number
33
- Positive
- Odd
- Composite
- 2 digits
33 is an odd 2-digit integer and a composite number. It has 4 divisors and a digital root of 6.
The canonical address for this page is /33.
Number properties
ParityOddnot divisible by 2
SignPositive
PrimalityComposite
Absolute value33
Digit count2
Digit sum6
Digital root6repeated digit sum
PalindromicYesreads the same backwards
Happy numberNosquared-digit sums reach 1
Harshad numberNodivisible by its own digit sum
Factors & divisors
Prime factorisation3 × 11
Distinct prime factors23, 11
Number of divisors4
Sum of divisors σ(n)48
Aliquot sum15sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)20integers below n that share no factor with it
SquarefreeYesno repeated prime factor
All divisors1, 3, 11, 334 in total
Arithmetic
Representations
Decimal33
Binary1000016 bits
Octal41
Hexadecimal21
Base 36X
Roman numeralXXXIII
In wordsthirty-three
Ordinalthirty-third
Scientific notation3.3 × 10^1
Engineering notation33
Nearest landmarks
Powers & multiples
33 to the power 21,089
33 to the power 335,937
33 to the power 41,185,921
33 to the power 539,135,393
First ten multiples33, 66, 99, 132, 165, 198, 231, 264, 297, 330
Powers of twoBetween 2^5 (32) and 2^6 (64)
Divisibility tests
Divisible by 2No, remainder 1
Divisible by 3Yes
Divisible by 4No, remainder 1
Divisible by 5No, remainder 3
Divisible by 6No, remainder 3
Divisible by 7No, remainder 5
Divisible by 8No, remainder 1
Divisible by 9No, remainder 6
Divisible by 10No, remainder 3
Divisible by 11Yes
Divisible by 12No, remainder 9
Divisible by 100No, remainder 33
Collatz (3n + 1) trajectory
Steps to reach 126the total stopping time
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps33 → 100 → 50 → 25 → 76 → 38 → 19 → 58 → 29 → 88 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage3,300%
33% as a decimal0.33
33% of 10033
33% of 1,000330
As a fraction of 10033/100
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Derived from 33
Other readings
Also reads as
#000033 (colour)
- #000033
- Blue
- Dark
- Nearest: Midnight blue
#000033 is a blue with RGB values 0, 0, 51 and HSL 240°, 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
#000033#000033
HEX#000033
HEX (short)#003
RGBrgb(0, 0, 51)
RGB (0–1)0, 0, 0.2
RGB percentages0%, 0%, 20%
HSLhsl(240, 100%, 10%)
HSV / HSBhsv(240, 100%, 20%)
CMYK100%, 100%, 0%, 80%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer51
CSS custom property--colour: #000033;
Brightness & contrast
Relative luminance0.00239WCAG 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 20.04:1
Contrast with white20.04:1WCAG normal text: AAA
Contrast with black1.05:1WCAG normal text: Fail
Greyscale equivalent#040404
Inverted#FFFFCC
Colour vision & accessibility
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text20.04:1WCAG 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#333300
Analogous#001A33, #1A0033
Triadic#330000, #003300
Split complementary#331A00, #1A3300
Tetradic#33001A, #333300, #00331A
Tints, shades & saturation
Channel breakdown
R0
G0
B51
Red0 (0%)
Green0 (0%)
Blue51 (20%)
Hue240°
Saturation (HSL)100%
Lightness10%
Dominant channelBlue
Hex per channelR 00 · G 00 · B 33
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Harmonies
Similar named colours
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