Number
513
- Positive
- Odd
- Composite
- 3 digits
513 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 value513
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 × 19
Distinct prime factors23, 19
Number of divisors8
Sum of divisors σ(n)800
Aliquot sum287sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)324integers below n that share no factor with it
SquarefreeNohas a repeated prime factor
All divisors1, 3, 9, 19, 27, 57, 171, 5138 in total
Arithmetic
Representations
Decimal513
Binary100000000110 bits
Octal1001
Hexadecimal201
Base 36E9
Roman numeralDXIII
In wordsfive hundred and thirteen
Ordinalfive hundred and thirteenth
Scientific notation5.13 × 10^2
Engineering notation513
Nearest landmarks
Powers & multiples
513 to the power 2263,169
513 to the power 3135,005,697
513 to the power 469,257,922,561
513 to the power 535,529,314,273,793
First ten multiples513, 1,026, 1,539, 2,052, 2,565, 3,078, 3,591, 4,104, 4,617, 5,130
Powers of twoBetween 2^9 (512) and 2^10 (1,024)
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 2
Divisible by 8No, remainder 1
Divisible by 9Yes
Divisible by 10No, remainder 3
Divisible by 11No, remainder 7
Divisible by 12No, remainder 9
Divisible by 100No, remainder 13
Collatz (3n + 1) trajectory
Steps to reach 135the total stopping time
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps513 → 1,540 → 770 → 385 → 1,156 → 578 → 289 → 868 → 434 → 217 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage51,300%
513% as a decimal5.13
513% of 100513
513% of 1,0005,130
As a fraction of 100513/100
Read another way
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Derived from 513
Other readings
Also reads as
#551133 (colour)
- #551133
- Red
- Dark
- Nearest: Black
#551133 is a red with RGB values 85, 17, 51 and HSL 330°, 67%, 20%. It is a dark colour, so white text on it reaches 13.9:1 contrast (AAA for normal text). The nearest named colour is Black.
Colour values
#551133#551133
HEX#551133
HEX (short)#513
RGBrgb(85, 17, 51)
RGB (0–1)0.3333, 0.0667, 0.2
RGB percentages33.3%, 6.7%, 20%
HSLhsl(330, 66.7%, 20%)
HSV / HSBhsv(330, 80%, 33.3%)
CMYK0%, 80%, 40%, 66.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer5,574,963
CSS custom property--colour: #551133;
Brightness & contrast
Relative luminance0.02571WCAG 2.x, 0 is black and 1 is white
Perceived brightness51.2 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 13.87:1
Contrast with white13.87:1WCAG normal text: AAA
Contrast with black1.51:1WCAG normal text: Fail
Greyscale equivalent#222222
Inverted#AAEECC
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text13.87:1WCAG large text: AAA
Contrast with black, large text1.51:1WCAG large text: Fail
Named colours
Hue familyred
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#115533
Analogous#551155, #551111
Triadic#335511, #113355
Split complementary#115511, #115555
Tetradic#555511, #115533, #111155
Tints, shades & saturation
Channel breakdown
R85
G17
B51
Red85 (33.3%)
Green17 (6.7%)
Blue51 (20%)
Hue330°
Saturation (HSL)66.67%
Lightness20%
Dominant channelRed
Hex per channelR 55 · G 11 · B 33
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