Number
509
- Positive
- Odd
- Prime
- 3 digits
509 is an odd 3-digit integer and a prime number. It has 2 divisors and a digital root of 5.
Number properties
ParityOddnot divisible by 2
SignPositive
PrimalityPrime
Absolute value509
Digit count3
Digit sum14
Digital root5repeated digit sum
PalindromicNoreads differently backwards
Happy numberNosquared-digit sums reach 1
Harshad numberNodivisible by its own digit sum
Factors & divisors
Prime factorisation509
Distinct prime factors1509
Number of divisors2
Sum of divisors σ(n)510
Aliquot sum1sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)508integers below n that share no factor with it
SquarefreeYesno repeated prime factor
All divisors1, 5092 in total
Arithmetic
Representations
Decimal509
Binary1111111019 bits
Octal775
Hexadecimal1FD
Base 36E5
Roman numeralDIX
In wordsfive hundred and nine
Ordinalfive hundred and ninth
Scientific notation5.09 × 10^2
Engineering notation509
Nearest landmarks
Powers & multiples
509 to the power 2259,081
509 to the power 3131,872,229
509 to the power 467,122,964,561
509 to the power 534,165,588,961,549
First ten multiples509, 1,018, 1,527, 2,036, 2,545, 3,054, 3,563, 4,072, 4,581, 5,090
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 1
Divisible by 5No, remainder 4
Divisible by 6No, remainder 5
Divisible by 7No, remainder 5
Divisible by 8No, remainder 5
Divisible by 9No, remainder 5
Divisible by 10No, remainder 9
Divisible by 11No, remainder 3
Divisible by 12No, remainder 5
Divisible by 100No, remainder 9
Collatz (3n + 1) trajectory
Steps to reach 148the total stopping time
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps509 → 1,528 → 764 → 382 → 191 → 574 → 287 → 862 → 431 → 1,294 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage50,900%
509% as a decimal5.09
509% of 100509
509% of 1,0005,090
As a fraction of 100509/100
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Derived from 509
Other readings
Also reads as
#550099 (colour)
- #550099
- Violet
- Dark
- Nearest: Indigo
#550099 is a violet with RGB values 85, 0, 153 and HSL 273°, 100%, 30%. It is a dark colour, so white text on it reaches 11.4:1 contrast (AAA for normal text). The nearest named colour is Indigo.
Colour values
#550099#550099
HEX#550099
HEX (short)#509
RGBrgb(85, 0, 153)
RGB (0–1)0.3333, 0, 0.6
RGB percentages33.3%, 0%, 60%
HSLhsl(273.3, 100%, 30%)
HSV / HSBhsv(273.3, 100%, 60%)
CMYK44.4%, 100%, 0%, 40%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer5,570,713
CSS custom property--colour: #550099;
Brightness & contrast
Relative luminance0.04231WCAG 2.x, 0 is black and 1 is white
Perceived brightness69.5 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 11.37:1
Contrast with white11.37:1WCAG normal text: AAA
Contrast with black1.85:1WCAG normal text: Fail
Greyscale equivalent#1D1D1D
Inverted#AAFF66
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text11.37:1WCAG large text: AAA
Contrast with black, large text1.85:1WCAG large text: Fail
Named colours
Hue familyviolet
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#449900
Analogous#080099, #990091
Triadic#995500, #009955
Split complementary#919900, #009908
Tetradic#990800, #449900, #009199
Tints, shades & saturation
Channel breakdown
R85
G0
B153
Red85 (33.3%)
Green0 (0%)
Blue153 (60%)
Hue273.33°
Saturation (HSL)100%
Lightness30%
Dominant channelBlue
Hex per channelR 55 · G 00 · B 99
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