Number
263
- Positive
- Odd
- Prime
- 3 digits
263 is an odd 3-digit integer and a prime number. It has 2 divisors and a digital root of 2.
Number properties
ParityOddnot divisible by 2
SignPositive
PrimalityPrime
Absolute value263
Digit count3
Digit sum11
Digital root2repeated digit sum
PalindromicNoreads differently backwards
Happy numberYessquared-digit sums reach 1
Harshad numberNodivisible by its own digit sum
Factors & divisors
Prime factorisation263
Distinct prime factors1263
Number of divisors2
Sum of divisors σ(n)264
Aliquot sum1sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)262integers below n that share no factor with it
SquarefreeYesno repeated prime factor
All divisors1, 2632 in total
Arithmetic
Representations
Decimal263
Binary1000001119 bits
Octal407
Hexadecimal107
Base 367B
Roman numeralCCLXIII
In wordstwo hundred and sixty-three
Ordinaltwo hundred and sixty-third
Scientific notation2.63 × 10^2
Engineering notation263
Nearest landmarks
Powers & multiples
263 to the power 269,169
263 to the power 318,191,447
263 to the power 44,784,350,561
263 to the power 51,258,284,197,543
First ten multiples263, 526, 789, 1,052, 1,315, 1,578, 1,841, 2,104, 2,367, 2,630
Powers of twoBetween 2^8 (256) and 2^9 (512)
Divisibility tests
Divisible by 2No, remainder 1
Divisible by 3No, remainder 2
Divisible by 4No, remainder 3
Divisible by 5No, remainder 3
Divisible by 6No, remainder 5
Divisible by 7No, remainder 4
Divisible by 8No, remainder 7
Divisible by 9No, remainder 2
Divisible by 10No, remainder 3
Divisible by 11No, remainder 10
Divisible by 12No, remainder 11
Divisible by 100No, remainder 63
Collatz (3n + 1) trajectory
Steps to reach 178the total stopping time
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps263 → 790 → 395 → 1,186 → 593 → 1,780 → 890 → 445 → 1,336 → 668 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage26,300%
263% as a decimal2.63
263% of 100263
263% of 1,0002,630
As a fraction of 100263/100
Read another way
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Derived from 263
Other readings
Also reads as
#226633 (colour)
- #226633
- Green
- Dark
- Nearest: Sea green
#226633 is a green with RGB values 34, 102, 51 and HSL 135°, 50%, 27%. It is a dark colour, so white text on it reaches 7:1 contrast (AA for normal text). The nearest named colour is Sea green.
Colour values
#226633#226633
HEX#226633
HEX (short)#263
RGBrgb(34, 102, 51)
RGB (0–1)0.1333, 0.4, 0.2
RGB percentages13.3%, 40%, 20%
HSLhsl(135, 50%, 26.7%)
HSV / HSBhsv(135, 66.7%, 40%)
CMYK66.7%, 0%, 50%, 60%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,254,387
CSS custom property--colour: #226633;
Brightness & contrast
Relative luminance0.10082WCAG 2.x, 0 is black and 1 is white
Perceived brightness82.2 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 6.96:1
Contrast with white6.96:1WCAG normal text: AA
Contrast with black3.02:1WCAG normal text: Fail
Greyscale equivalent#545454
Inverted#DD99CC
Colour vision & accessibility
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text6.96:1WCAG large text: AAA
Contrast with black, large text3.02:1WCAG large text: AA
Named colours
Hue familygreen
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#662255
Analogous#336622, #226655
Triadic#332266, #663322
Split complementary#552266, #662233
Tetradic#223366, #662255, #665522
Tints, shades & saturation
Channel breakdown
R34
G102
B51
Red34 (13.3%)
Green102 (40%)
Blue51 (20%)
Hue135°
Saturation (HSL)50%
Lightness26.67%
Dominant channelGreen
Hex per channelR 22 · G 66 · B 33
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Harmonies
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