Number
115
- Positive
- Odd
- Composite
- 3 digits
115 is an odd 3-digit integer and a composite number. It has 4 divisors and a digital root of 7.
Number properties
ParityOddnot divisible by 2
SignPositive
PrimalityComposite
Absolute value115
Digit count3
Digit sum7
Digital root7repeated digit sum
PalindromicNoreads differently backwards
Happy numberNosquared-digit sums reach 1
Harshad numberNodivisible by its own digit sum
Factors & divisors
Prime factorisation5 × 23
Distinct prime factors25, 23
Number of divisors4
Sum of divisors σ(n)144
Aliquot sum29sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)88integers below n that share no factor with it
SquarefreeYesno repeated prime factor
All divisors1, 5, 23, 1154 in total
Arithmetic
Representations
Decimal115
Binary11100117 bits
Octal163
Hexadecimal73
Base 3637
Roman numeralCXV
In wordsone hundred and fifteen
Ordinalone hundred and fifteenth
Scientific notation1.15 × 10^2
Engineering notation115
Nearest landmarks
Powers & multiples
115 to the power 213,225
115 to the power 31,520,875
115 to the power 4174,900,625
115 to the power 520,113,571,875
First ten multiples115, 230, 345, 460, 575, 690, 805, 920, 1,035, 1,150
Powers of twoBetween 2^6 (64) and 2^7 (128)
Divisibility tests
Divisible by 2No, remainder 1
Divisible by 3No, remainder 1
Divisible by 4No, remainder 3
Divisible by 5Yes
Divisible by 6No, remainder 1
Divisible by 7No, remainder 3
Divisible by 8No, remainder 3
Divisible by 9No, remainder 7
Divisible by 10No, remainder 5
Divisible by 11No, remainder 5
Divisible by 12No, remainder 7
Divisible by 100No, remainder 15
Collatz (3n + 1) trajectory
Steps to reach 133the total stopping time
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps115 → 346 → 173 → 520 → 260 → 130 → 65 → 196 → 98 → 49 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage11,500%
115% as a decimal1.15
115% of 100115
115% of 1,0001,150
As a fraction of 100115/100
Read another way
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Derived from 115
Other readings
Also reads as
#111155 (colour)
- #111155
- Blue
- Dark
- Nearest: Midnight blue
#111155 is a blue with RGB values 17, 17, 85 and HSL 240°, 67%, 20%. It is a dark colour, so white text on it reaches 17:1 contrast (AAA for normal text). The nearest named colour is Midnight blue.
Colour values
#111155#111155
HEX#111155
HEX (short)#115
RGBrgb(17, 17, 85)
RGB (0–1)0.0667, 0.0667, 0.3333
RGB percentages6.7%, 6.7%, 33.3%
HSLhsl(240, 66.7%, 20%)
HSV / HSBhsv(240, 80%, 33.3%)
CMYK80%, 80%, 0%, 66.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,118,549
CSS custom property--colour: #111155;
Brightness & contrast
Relative luminance0.01176WCAG 2.x, 0 is black and 1 is white
Perceived brightness32.9 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 17:1
Contrast with white17:1WCAG normal text: AAA
Contrast with black1.24:1WCAG normal text: Fail
Greyscale equivalent#161616
Inverted#EEEEAA
Colour vision & accessibility
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text17:1WCAG large text: AAA
Contrast with black, large text1.24:1WCAG large text: Fail
Named colours
Hue familyblue
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#555511
Analogous#113355, #331155
Triadic#551111, #115511
Split complementary#553311, #335511
Tetradic#551133, #555511, #115533
Tints, shades & saturation
Channel breakdown
R17
G17
B85
Red17 (6.7%)
Green17 (6.7%)
Blue85 (33.3%)
Hue240°
Saturation (HSL)66.67%
Lightness20%
Dominant channelBlue
Hex per channelR 11 · G 11 · B 55
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Harmonies
Similar named colours
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