Number
109
- Positive
- Odd
- Prime
- 3 digits
109 is an odd 3-digit integer and a prime number. It has 2 divisors and a digital root of 1.
Number properties
ParityOddnot divisible by 2
SignPositive
PrimalityPrime
Absolute value109
Digit count3
Digit sum10
Digital root1repeated digit sum
PalindromicNoreads differently backwards
Happy numberYessquared-digit sums reach 1
Harshad numberNodivisible by its own digit sum
Factors & divisors
Prime factorisation109
Distinct prime factors1109
Number of divisors2
Sum of divisors σ(n)110
Aliquot sum1sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)108integers below n that share no factor with it
SquarefreeYesno repeated prime factor
All divisors1, 1092 in total
Arithmetic
Representations
Decimal109
Binary11011017 bits
Octal155
Hexadecimal6D
Base 3631
Roman numeralCIX
In wordsone hundred and nine
Ordinalone hundred and ninth
Scientific notation1.09 × 10^2
Engineering notation109
Nearest landmarks
Powers & multiples
109 to the power 211,881
109 to the power 31,295,029
109 to the power 4141,158,161
109 to the power 515,386,239,549
First ten multiples109, 218, 327, 436, 545, 654, 763, 872, 981, 1,090
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 1
Divisible by 5No, remainder 4
Divisible by 6No, remainder 1
Divisible by 7No, remainder 4
Divisible by 8No, remainder 5
Divisible by 9No, remainder 1
Divisible by 10No, remainder 9
Divisible by 11No, remainder 10
Divisible by 12No, remainder 1
Divisible by 100No, remainder 9
Collatz (3n + 1) trajectory
Steps to reach 1113the total stopping time
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps109 → 328 → 164 → 82 → 41 → 124 → 62 → 31 → 94 → 47 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage10,900%
109% as a decimal1.09
109% of 100109
109% of 1,0001,090
As a fraction of 100109/100
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Derived from 109
Other readings
Also reads as
#110099 (colour)
- #110099
- Blue
- Dark
- Nearest: Dark blue
#110099 is a blue with RGB values 17, 0, 153 and HSL 247°, 100%, 30%. It is a dark colour, so white text on it reaches 14.2:1 contrast (AAA for normal text). The nearest named colour is Dark blue.
Colour values
#110099#110099
HEX#110099
HEX (short)#109
RGBrgb(17, 0, 153)
RGB (0–1)0.0667, 0, 0.6
RGB percentages6.7%, 0%, 60%
HSLhsl(246.7, 100%, 30%)
HSV / HSBhsv(246.7, 100%, 60%)
CMYK88.9%, 100%, 0%, 40%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,114,265
CSS custom property--colour: #110099;
Brightness & contrast
Relative luminance0.02419WCAG 2.x, 0 is black and 1 is white
Perceived brightness52.5 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 14.15:1
Contrast with white14.15:1WCAG normal text: AAA
Contrast with black1.48:1WCAG normal text: Fail
Greyscale equivalent#0F0F0F
Inverted#EEFF66
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text14.15:1WCAG large text: AAA
Contrast with black, large text1.48:1WCAG large text: Fail
Named colours
Hue familyblue
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#889900
Analogous#003C99, #5D0099
Triadic#991100, #009911
Split complementary#995D00, #3C9900
Tetradic#99003C, #889900, #00995D
Tints, shades & saturation
Channel breakdown
R17
G0
B153
Red17 (6.7%)
Green0 (0%)
Blue153 (60%)
Hue246.67°
Saturation (HSL)100%
Lightness30%
Dominant channelBlue
Hex per channelR 11 · G 00 · B 99
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