Number
101
- Positive
- Odd
- Prime
- 3 digits
101 is an odd 3-digit integer and a prime number. It has 2 divisors and a digital root of 2.
The canonical address for this page is /101.
Number properties
ParityOddnot divisible by 2
SignPositive
PrimalityPrime
Absolute value101
Digit count3
Digit sum2
Digital root2repeated digit sum
PalindromicYesreads the same backwards
Happy numberNosquared-digit sums reach 1
Harshad numberNodivisible by its own digit sum
Factors & divisors
Prime factorisation101
Distinct prime factors1101
Number of divisors2
Sum of divisors σ(n)102
Aliquot sum1sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)100integers below n that share no factor with it
SquarefreeYesno repeated prime factor
All divisors1, 1012 in total
Arithmetic
Representations
Decimal101
Binary11001017 bits
Octal145
Hexadecimal65
Base 362T
Roman numeralCI
In wordsone hundred and one
Ordinalone hundred and first
Scientific notation1.01 × 10^2
Engineering notation101
Nearest landmarks
Powers & multiples
101 to the power 210,201
101 to the power 31,030,301
101 to the power 4104,060,401
101 to the power 510,510,100,501
First ten multiples101, 202, 303, 404, 505, 606, 707, 808, 909, 1,010
Powers of twoBetween 2^6 (64) and 2^7 (128)
Divisibility tests
Divisible by 2No, remainder 1
Divisible by 3No, remainder 2
Divisible by 4No, remainder 1
Divisible by 5No, remainder 1
Divisible by 6No, remainder 5
Divisible by 7No, remainder 3
Divisible by 8No, remainder 5
Divisible by 9No, remainder 2
Divisible by 10No, remainder 1
Divisible by 11No, remainder 2
Divisible by 12No, remainder 5
Divisible by 100No, remainder 1
Collatz (3n + 1) trajectory
Steps to reach 125the total stopping time
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps101 → 304 → 152 → 76 → 38 → 19 → 58 → 29 → 88 → 44 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage10,100%
101% as a decimal1.01
101% of 100101
101% of 1,0001,010
As a fraction of 100101/100
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Derived from 101
Other readings
Also reads as
#000101 (colour)
- #000101
- Cyan
- Dark
- Nearest: Black
#000101 is a cyan with RGB values 0, 1, 1 and HSL 180°, 100%, 0%. It is a dark colour, so white text on it reaches 20.9:1 contrast (AAA for normal text). The nearest named colour is Black.
Colour values
#000101#000101
HEX#000101
RGBrgb(0, 1, 1)
RGB (0–1)0, 0.0039, 0.0039
RGB percentages0%, 0.4%, 0.4%
HSLhsl(180, 100%, 0.2%)
HSV / HSBhsv(180, 100%, 0.4%)
CMYK100%, 0%, 0%, 99.6%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer257
CSS custom property--colour: #000101;
Brightness & contrast
Relative luminance0.00024WCAG 2.x, 0 is black and 1 is white
Perceived brightness0.8 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 20.9:1
Contrast with white20.9:1WCAG normal text: AAA
Contrast with black1:1WCAG normal text: Fail
Greyscale equivalent#010101
Inverted#FFFEFE
Colour vision & accessibility
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text20.9:1WCAG large text: AAA
Contrast with black, large text1:1WCAG large text: Fail
Named colours
Hue familycyan
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#010000
Analogous#000101, #000101
Triadic#010001, #010100
Split complementary#010001, #010100
Tetradic#010001, #010000, #010100
Tints, shades & saturation
Channel breakdown
R0
G1
B1
Red0 (0%)
Green1 (0.4%)
Blue1 (0.4%)
Hue180°
Saturation (HSL)100%
Lightness0.2%
Dominant channelGreen and Blue
Hex per channelR 00 · G 01 · B 01
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