Number
173
- Positive
- Odd
- Prime
- 3 digits
173 is an odd 3-digit integer and a prime number. It has 2 divisors and a digital root of 2.
Number properties
ParityOddnot divisible by 2
SignPositive
PrimalityPrime
Absolute value173
Digit count3
Digit sum11
Digital root2repeated digit sum
PalindromicNoreads differently backwards
Happy numberNosquared-digit sums reach 1
Harshad numberNodivisible by its own digit sum
Factors & divisors
Prime factorisation173
Distinct prime factors1173
Number of divisors2
Sum of divisors σ(n)174
Aliquot sum1sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)172integers below n that share no factor with it
SquarefreeYesno repeated prime factor
All divisors1, 1732 in total
Arithmetic
Representations
Decimal173
Binary101011018 bits
Octal255
HexadecimalAD
Base 364T
Roman numeralCLXXIII
In wordsone hundred and seventy-three
Ordinalone hundred and seventy-third
Scientific notation1.73 × 10^2
Engineering notation173
Nearest landmarks
Powers & multiples
173 to the power 229,929
173 to the power 35,177,717
173 to the power 4895,745,041
173 to the power 5154,963,892,093
First ten multiples173, 346, 519, 692, 865, 1,038, 1,211, 1,384, 1,557, 1,730
Powers of twoBetween 2^7 (128) and 2^8 (256)
Divisibility tests
Divisible by 2No, remainder 1
Divisible by 3No, remainder 2
Divisible by 4No, remainder 1
Divisible by 5No, remainder 3
Divisible by 6No, remainder 5
Divisible by 7No, remainder 5
Divisible by 8No, remainder 5
Divisible by 9No, remainder 2
Divisible by 10No, remainder 3
Divisible by 11No, remainder 8
Divisible by 12No, remainder 5
Divisible by 100No, remainder 73
Collatz (3n + 1) trajectory
Steps to reach 131the total stopping time
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps173 → 520 → 260 → 130 → 65 → 196 → 98 → 49 → 148 → 74 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage17,300%
173% as a decimal1.73
173% of 100173
173% of 1,0001,730
As a fraction of 100173/100
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Derived from 173
Other readings
Also reads as
#117733 (colour)
- #117733
- Green
- Dark
- Nearest: Sea green
#117733 is a green with RGB values 17, 119, 51 and HSL 140°, 75%, 27%. It is a dark colour, so white text on it reaches 5.7:1 contrast (AA for normal text). The nearest named colour is Sea green.
Colour values
#117733#117733
HEX#117733
HEX (short)#173
RGBrgb(17, 119, 51)
RGB (0–1)0.0667, 0.4667, 0.2
RGB percentages6.7%, 46.7%, 20%
HSLhsl(140, 75%, 26.7%)
HSV / HSBhsv(140, 85.7%, 46.7%)
CMYK85.7%, 0%, 57.1%, 53.3%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,144,627
CSS custom property--colour: #117733;
Brightness & contrast
Relative luminance0.13552WCAG 2.x, 0 is black and 1 is white
Perceived brightness93.2 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 5.66:1
Contrast with white5.66:1WCAG normal text: AA
Contrast with black3.71:1WCAG normal text: Fail
Greyscale equivalent#5C5C5C
Inverted#EE88CC
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text5.66:1WCAG large text: AAA
Contrast with black, large text3.71:1WCAG large text: AA
Named colours
Hue familygreen
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#771155
Analogous#227711, #117766
Triadic#331177, #773311
Split complementary#661177, #771122
Tetradic#112277, #771155, #776611
Tints, shades & saturation
Channel breakdown
R17
G119
B51
Red17 (6.7%)
Green119 (46.7%)
Blue51 (20%)
Hue140°
Saturation (HSL)75%
Lightness26.67%
Dominant channelGreen
Hex per channelR 11 · G 77 · B 33
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Harmonies
Similar named colours
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