Number
351
- Positive
- Odd
- Composite
- 3 digits
351 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 value351
Digit count3
Digit sum9
Digital root9repeated digit sum
PalindromicNoreads differently backwards
Triangular numberYes, the 26th triangular number
Happy numberNosquared-digit sums reach 1
Harshad numberYesdivisible by its own digit sum
Factors & divisors
Prime factorisation3^3 × 13
Distinct prime factors23, 13
Number of divisors8
Sum of divisors σ(n)560
Aliquot sum209sum 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
SquarefreeNohas a repeated prime factor
All divisors1, 3, 9, 13, 27, 39, 117, 3518 in total
Arithmetic
Representations
Decimal351
Binary1010111119 bits
Octal537
Hexadecimal15F
Base 369R
Roman numeralCCCLI
In wordsthree hundred and fifty-one
Ordinalthree hundred and fifty-first
Scientific notation3.51 × 10^2
Engineering notation351
Nearest landmarks
Powers & multiples
351 to the power 2123,201
351 to the power 343,243,551
351 to the power 415,178,486,401
351 to the power 55,327,648,726,751
First ten multiples351, 702, 1,053, 1,404, 1,755, 2,106, 2,457, 2,808, 3,159, 3,510
Powers of twoBetween 2^8 (256) and 2^9 (512)
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 1
Divisible by 8No, remainder 7
Divisible by 9Yes
Divisible by 10No, remainder 1
Divisible by 11No, remainder 10
Divisible by 12No, remainder 3
Divisible by 100No, remainder 51
Collatz (3n + 1) trajectory
Steps to reach 181the total stopping time
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps351 → 1,054 → 527 → 1,582 → 791 → 2,374 → 1,187 → 3,562 → 1,781 → 5,344 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage35,100%
351% as a decimal3.51
351% of 100351
351% of 1,0003,510
As a fraction of 100351/100
Read another way
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Derived from 351
Other readings
Also reads as
#335511 (colour)
- #335511
- Green
- Dark
- Nearest: Dark olivegreen
#335511 is a green with RGB values 51, 85, 17 and HSL 90°, 67%, 20%. It is a dark colour, so white text on it reaches 8.6:1 contrast (AAA for normal text). The nearest named colour is Dark olivegreen.
Colour values
#335511#335511
HEX#335511
HEX (short)#351
RGBrgb(51, 85, 17)
RGB (0–1)0.2, 0.3333, 0.0667
RGB percentages20%, 33.3%, 6.7%
HSLhsl(90, 66.7%, 20%)
HSV / HSBhsv(90, 80%, 33.3%)
CMYK40%, 0%, 80%, 66.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer3,364,113
CSS custom property--colour: #335511;
Brightness & contrast
Relative luminance0.07241WCAG 2.x, 0 is black and 1 is white
Perceived brightness71.1 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 8.58:1
Contrast with white8.58:1WCAG normal text: AAA
Contrast with black2.45:1WCAG normal text: Fail
Greyscale equivalent#494949
Inverted#CCAAEE
Colour vision & accessibility
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text8.58:1WCAG large text: AAA
Contrast with black, large text2.45:1WCAG large text: Fail
Named colours
Hue familygreen
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#331155
Analogous#555511, #115511
Triadic#113355, #551133
Split complementary#111155, #551155
Tetradic#115555, #331155, #551111
Tints, shades & saturation
Channel breakdown
R51
G85
B17
Red51 (20%)
Green85 (33.3%)
Blue17 (6.7%)
Hue90°
Saturation (HSL)66.67%
Lightness20%
Dominant channelGreen
Hex per channelR 33 · G 55 · B 11
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Harmonies
Similar named colours
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