Number
197
- Positive
- Odd
- Prime
- 3 digits
197 is an odd 3-digit integer and a prime number. It has 2 divisors and a digital root of 8.
Number properties
ParityOddnot divisible by 2
SignPositive
PrimalityPrime
Absolute value197
Digit count3
Digit sum17
Digital root8repeated digit sum
PalindromicNoreads differently backwards
Happy numberNosquared-digit sums reach 1
Harshad numberNodivisible by its own digit sum
Factors & divisors
Prime factorisation197
Distinct prime factors1197
Number of divisors2
Sum of divisors σ(n)198
Aliquot sum1sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)196integers below n that share no factor with it
SquarefreeYesno repeated prime factor
All divisors1, 1972 in total
Arithmetic
Representations
Decimal197
Binary110001018 bits
Octal305
HexadecimalC5
Base 365H
Roman numeralCXCVII
In wordsone hundred and ninety-seven
Ordinalone hundred and ninety-seventh
Scientific notation1.97 × 10^2
Engineering notation197
Nearest landmarks
Powers & multiples
197 to the power 238,809
197 to the power 37,645,373
197 to the power 41,506,138,481
197 to the power 5296,709,280,757
First ten multiples197, 394, 591, 788, 985, 1,182, 1,379, 1,576, 1,773, 1,970
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 2
Divisible by 6No, remainder 5
Divisible by 7No, remainder 1
Divisible by 8No, remainder 5
Divisible by 9No, remainder 8
Divisible by 10No, remainder 7
Divisible by 11No, remainder 10
Divisible by 12No, remainder 5
Divisible by 100No, remainder 97
Collatz (3n + 1) trajectory
Steps to reach 126the total stopping time
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps197 → 592 → 296 → 148 → 74 → 37 → 112 → 56 → 28 → 14 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage19,700%
197% as a decimal1.97
197% of 100197
197% of 1,0001,970
As a fraction of 100197/100
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Derived from 197
Other readings
Also reads as
#119977 (colour)
- #119977
- Cyan
- Dark
- Nearest: Sea green
#119977 is a cyan with RGB values 17, 153, 119 and HSL 165°, 80%, 33%. It is a dark colour, so black text on it reaches 5.8:1 contrast (AA for normal text). The nearest named colour is Sea green.
Colour values
#119977#119977
HEX#119977
HEX (short)#197
RGBrgb(17, 153, 119)
RGB (0–1)0.0667, 0.6, 0.4667
RGB percentages6.7%, 60%, 46.7%
HSLhsl(165, 80%, 33.3%)
HSV / HSBhsv(165, 88.9%, 60%)
CMYK88.9%, 0%, 22.2%, 40%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,153,399
CSS custom property--colour: #119977;
Brightness & contrast
Relative luminance0.24234WCAG 2.x, 0 is black and 1 is white
Perceived brightness124.3 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 5.85:1
Contrast with white3.59:1WCAG normal text: Fail
Contrast with black5.85:1WCAG normal text: AA
Greyscale equivalent#7A7A7A
Inverted#EE6688
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text3.59:1WCAG large text: AA
Contrast with black, large text5.85:1WCAG large text: AAA
Named colours
Hue familycyan
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#991133
Analogous#119933, #117799
Triadic#771199, #997711
Split complementary#991177, #993311
Tetradic#331199, #991133, #779911
Tints, shades & saturation
Channel breakdown
R17
G153
B119
Red17 (6.7%)
Green153 (60%)
Blue119 (46.7%)
Hue165°
Saturation (HSL)80%
Lightness33.33%
Dominant channelGreen
Hex per channelR 11 · G 99 · B 77
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Harmonies
Similar named colours
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