Recognised as Number
591
- Positive
- Odd
- Composite
- 3 digits
591 is an odd 3-digit integer and a composite number. It has 4 divisors and a digital root of 6.
Number properties
ParityOddnot divisible by 2
SignPositive
PrimalityComposite
Absolute value591
Digit count3
Digit sum15
Digit product45
Multiplicative persistence3times the digit product can be taken before one digit is left
Digital root6repeated digit sum
PalindromicNoreads differently backwards
Happy numberNosquared-digit sums reach 1
Harshad numberNodivisible by its own digit sum
Factors & divisors
Prime factorisation3 × 197
Distinct prime factors23, 197
Number of divisors4
Sum of divisors σ(n)792
Aliquot sum201sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)392integers below n that share no factor with it
Carmichael function λ(n)196the smallest exponent with aˣ ≡ 1 for every unit; smaller than φ(n) = 392
Möbius function μ(n)+12 distinct prime factors, an even number of them
SquarefreeYesno repeated prime factor
All divisors1, 3, 197, 5914 in total
Arithmetic
Representations
Decimal591
Binary100100111110 bits
Octal1117
Hexadecimal24F
Base 36GF
Roman numeralDXCI
In wordsfive hundred and ninety-one
Ordinalfive hundred and ninety-first
Scientific notation5.91 × 10^2
Engineering notation591
In other bases
Ternary210220base 3; the most digit-efficient integer base after e: 6 digits
Quinary4331base 5; one hand: 4 digits
Septenary1503base 7: 4 digits
Nonary726base 9; each digit is two ternary digits: 3 digits
Duodecimal413base 12; divides by 2, 3, 4 and 6, which is why eggs and inches come in twelves: 3 digits
Vigesimal19bbase 20; hands and feet, and the Mayan and Yoruba systems: 3 digits
Sexagesimal9:51base 60; Babylonian, and still how an hour and a circle are divided: 2 digits
Balanced ternary1T110T0digits −1, 0 and +1 written T, 0 and 1; negation is swapping T and 1, so no sign is needed
Negabinary11001010011base −2; place values alternate 1, −2, 4, −8, so every integer has exactly one form without a sign
Bit-level
0000001001001111
Bit length10 bitsto write the magnitude
Set bits6the population count, or Hamming weight
Zero bits4within that length
Bit parityeven6 set bits, so even; not the same as the number itself being odd
Highest set bitbit 9worth 512
Lowest set bitbit 00 trailing zeros
Power of twoNo
Bytes202 4f
Gray code1101101000n XOR (n >> 1); successive values differ in exactly one bit
At each machine width
16-bit0000001001001111
32-bit00000000000000000000001001001111
64-bit0000000000000000000000000000000000000000000000000000001001001111
One's complement1111110110110000at 16 bits, every bit flipped
Bits reversed1111001001000000at 16 bits
Rotated left by 10000010010011110at 16 bits, wrapping
Shifted left by 110010011110= 1,182, no wrap
Shifted right by 1100100111= 295, discarding the low bit
These bits as a double2.91992797 × 10^-321≈IEEE-754 binary64 reinterpretation of the same 64 bits (subnormal)
Nearest landmarks
Powers & multiples
591 to the power 2349,281
591 to the power 3206,425,071
591 to the power 4121,997,216,961
591 to the power 572,100,355,223,951
First ten multiples591, 1,182, 1,773, 2,364, 2,955, 3,546, 4,137, 4,728, 5,319, 5,910
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 3
Divisible by 5No, remainder 1
Divisible by 6No, remainder 3
Divisible by 7No, remainder 3
Divisible by 8No, remainder 7
Divisible by 9No, remainder 6
Divisible by 10No, remainder 1
Divisible by 11No, remainder 8
Divisible by 12No, remainder 3
Divisible by 100No, remainder 91
Collatz (3n + 1) trajectory
Steps to reach 156the total stopping time
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps591 → 1,774 → 887 → 2,662 → 1,331 → 3,994 → 1,997 → 5,992 → 2,996 → 1,498 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage59,100%
591% as a decimal5.91
591% of 100591
591% of 1,0005,910
As a fraction of 100591/100
Read another way
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Derived from 591
Other readings
Also reads as
#559911 (colour)
- #559911
- Green
- Dark
- Nearest: Forest green
#559911 is a green with RGB values 85, 153, 17 and HSL 90°, 80%, 33%. It is a dark colour, so black text on it reaches 6:1 contrast (AA for normal text). The nearest named colour is Forest green.
Colour values
#559911#559911
HEX#559911
HEX (short)#591
RGBrgb(85, 153, 17)
RGB (0–1)0.3333, 0.6, 0.0667
RGB percentages33.3%, 60%, 6.7%
HSLhsl(90, 80%, 33.3%)
HSV / HSBhsv(90, 88.9%, 60%)
CMYK44.4%, 0%, 88.9%, 40%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer5,609,745
CSS custom property--colour: #559911;
Brightness & contrast
Relative luminance0.24754WCAG 2.x, 0 is black and 1 is white
Perceived brightness126.2 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 5.95:1
Contrast with white3.53:1WCAG normal text: Fail
Contrast with black5.95:1WCAG normal text: AA
Greyscale equivalent#818181
Inverted#AA66EE
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text3.53:1WCAG large text: AA
Contrast with black, large text5.95:1WCAG large text: AAA
Named colours
Hue familygreen
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#551199
Analogous#999911, #119911
Triadic#115599, #991155
Split complementary#111199, #991199
Tetradic#119999, #551199, #991111
Tints, shades & saturation
Channel breakdown
R85
G153
B17
Red85 (33.3%)
Green153 (60%)
Blue17 (6.7%)
Hue90°
Saturation (HSL)80%
Lightness33.33%
Dominant channelGreen
Hex per channelR 55 · G 99 · B 11
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Harmonies
Similar named colours
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