Number
518
- Positive
- Even
- Composite
- 3 digits
518 is an even 3-digit integer and a composite number. It has 8 divisors and a digital root of 5.
Number properties
ParityEvendivisible by 2
SignPositive
PrimalityComposite
Absolute value518
Digit count3
Digit sum14
Digital root5repeated digit sum
PalindromicNoreads differently backwards
Happy numberNosquared-digit sums reach 1
Harshad numberYesdivisible by its own digit sum
Factors & divisors
Prime factorisation2 × 7 × 37
Distinct prime factors32, 7, 37
Number of divisors8
Sum of divisors σ(n)912
Aliquot sum394sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)216integers below n that share no factor with it
SquarefreeYesno repeated prime factor
All divisors1, 2, 7, 14, 37, 74, 259, 5188 in total
Arithmetic
Representations
Decimal518
Binary100000011010 bits
Octal1006
Hexadecimal206
Base 36EE
Roman numeralDXVIII
In wordsfive hundred and eighteen
Ordinalfive hundred and eighteenth
Scientific notation5.18 × 10^2
Engineering notation518
Nearest landmarks
Powers & multiples
518 to the power 2268,324
518 to the power 3138,991,832
518 to the power 471,997,768,976
518 to the power 537,294,844,329,568
First ten multiples518, 1,036, 1,554, 2,072, 2,590, 3,108, 3,626, 4,144, 4,662, 5,180
Powers of twoBetween 2^9 (512) and 2^10 (1,024)
Divisibility tests
Divisible by 2Yes
Divisible by 3No, remainder 2
Divisible by 4No, remainder 2
Divisible by 5No, remainder 3
Divisible by 6No, remainder 2
Divisible by 7Yes
Divisible by 8No, remainder 6
Divisible by 9No, remainder 5
Divisible by 10No, remainder 8
Divisible by 11No, remainder 1
Divisible by 12No, remainder 2
Divisible by 100No, remainder 18
Collatz (3n + 1) trajectory
Steps to reach 1123the total stopping time
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps518 → 259 → 778 → 389 → 1,168 → 584 → 292 → 146 → 73 → 220 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage51,800%
518% as a decimal5.18
518% of 100518
518% of 1,0005,180
As a fraction of 100518/100
Read another way
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Derived from 518
Other readings
Also reads as
#551188 (colour)
- #551188
- Violet
- Dark
- Nearest: Indigo
#551188 is a violet with RGB values 85, 17, 136 and HSL 274°, 78%, 30%. It is a dark colour, so white text on it reaches 11.5:1 contrast (AAA for normal text). The nearest named colour is Indigo.
Colour values
#551188#551188
HEX#551188
HEX (short)#518
RGBrgb(85, 17, 136)
RGB (0–1)0.3333, 0.0667, 0.5333
RGB percentages33.3%, 6.7%, 53.3%
HSLhsl(274.3, 77.8%, 30%)
HSV / HSBhsv(274.3, 87.5%, 53.3%)
CMYK37.5%, 87.5%, 0%, 46.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer5,575,048
CSS custom property--colour: #551188;
Brightness & contrast
Relative luminance0.0411WCAG 2.x, 0 is black and 1 is white
Perceived brightness66.6 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 11.53:1
Contrast with white11.53:1WCAG normal text: AAA
Contrast with black1.82:1WCAG normal text: Fail
Greyscale equivalent#282828
Inverted#AAEE77
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text11.53:1WCAG large text: AAA
Contrast with black, large text1.82:1WCAG large text: Fail
Named colours
Hue familyviolet
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#448811
Analogous#191188, #881180
Triadic#885511, #118855
Split complementary#808811, #118819
Tetradic#881911, #448811, #118088
Tints, shades & saturation
Channel breakdown
R85
G17
B136
Red85 (33.3%)
Green17 (6.7%)
Blue136 (53.3%)
Hue274.29°
Saturation (HSL)77.78%
Lightness30%
Dominant channelBlue
Hex per channelR 55 · G 11 · B 88
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