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Number

171

  • Positive
  • Odd
  • Composite
  • 3 digits

171 is an odd 3-digit integer and a composite number. It has 6 divisors and a digital root of 9.

Number properties

ParityOddnot divisible by 2
SignPositive
PrimalityComposite
Absolute value171
Digit count3
Digit sum9
Digital root9repeated digit sum
PalindromicYesreads the same backwards
Triangular numberYes, the 18th triangular number
Happy numberNosquared-digit sums reach 1
Harshad numberYesdivisible by its own digit sum

Factors & divisors

Prime factorisation3^2 × 19
Distinct prime factors23, 19
Number of divisors6
Sum of divisors σ(n)260
Aliquot sum89sum 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
SquarefreeNohas a repeated prime factor
All divisors1, 3, 9, 19, 57, 1716 in total

Arithmetic

Previous number170
Next number172
Double342
Half85.5
Square29,241
Cube5,000,211
Square root13.076696831≈irrational, shown to 9 decimal places
Cube root5.550499103≈
Negation-171
Reciprocal0.0058479532≈
171 factorial1241018070217667823424840524103103992616… (310 digits)

Representations

Decimal171
Binary101010118 bits
Octal253
HexadecimalAB
Base 364R
Roman numeralCLXXI
In wordsone hundred and seventy-one
Ordinalone hundred and seventy-first
Scientific notation1.71 × 10^2
Engineering notation171

Nearest landmarks

Next prime173+2
Previous prime167−4
Distance to nearest prime2
Nearest square below169
Nearest square above196

Powers & multiples

171 to the power 229,241
171 to the power 35,000,211
171 to the power 4855,036,081
171 to the power 5146,211,169,851
First ten multiples171, 342, 513, 684, 855, 1,026, 1,197, 1,368, 1,539, 1,710
Powers of twoBetween 2^7 (128) and 2^8 (256)

Divisibility tests

Divisible by 2No, remainder 1
Divisible by 3Yes
Divisible by 4No, remainder 3
Divisible by 5No, remainder 1
Divisible by 6No, remainder 3
Divisible by 7No, remainder 3
Divisible by 8No, remainder 3
Divisible by 9Yes
Divisible by 10No, remainder 1
Divisible by 11No, remainder 6
Divisible by 12No, remainder 3
Divisible by 100No, remainder 71

Collatz (3n + 1) trajectory

Steps to reach 1124the total stopping time
Highest value reached9,23253× the starting value
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps171 → 514 → 257 → 772 → 386 → 193 → 580 → 290 → 145 → 436 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1

As a percentage & fraction

As a percentage17,100%
171% as a decimal1.71
171% of 100171
171% of 1,0001,710
As a fraction of 100171/100

Read another way

As seconds2 minutes and 51 seconds
As bytes171 B
As a 24-bit colour#0000AB

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Neighbouring numbers

Nearby primes

Also reads as

#117711 (colour)

  • #117711
  • Green
  • Dark
  • Nearest: Forest green

#117711 is a green with RGB values 17, 119, 17 and HSL 120°, 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 Forest green.

Open this reading on its own page →

Colour values

#117711#117711
HEX#117711
HEX (short)#171
RGBrgb(17, 119, 17)
RGB (0–1)0.0667, 0.4667, 0.0667
RGB percentages6.7%, 46.7%, 6.7%
HSLhsl(120, 75%, 26.7%)
HSV / HSBhsv(120, 85.7%, 46.7%)
CMYK85.7%, 0%, 85.7%, 53.3%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,144,593
CSS custom property--colour: #117711;

Brightness & contrast

Relative luminance0.13353WCAG 2.x, 0 is black and 1 is white
Perceived brightness91.8 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 5.72:1
Contrast with white5.72:1WCAG normal text: AA
Contrast with black3.67:1WCAG normal text: Fail
Greyscale equivalent#5A5A5A
Inverted#EE88EE

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#7A6B00no red cones; affects about 1% of men; ΔE 43.3 from the original
Deuteranopia#6F631Eno green cones; the most common form, about 1% of men; ΔE 43.1 from the original
Tritanopia#007365no blue cones; rare, and affects men and women equally; ΔE 46.4 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text5.72:1WCAG large text: AAA
Contrast with black, large text3.67:1WCAG large text: AA

Named colours

Forest green · ΔE 8Dark green · ΔE 8Green · ΔE 8.6Olivedrab · ΔE 22.5Sea green · ΔE 25.9Medium seagreen · ΔE 29.3
Nearest named CSS colourForest green (#228B22)ΔE 7.98, clearly different but related
Hue familygreen
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#771177
Analogous#447711, #117744
Triadic#111177, #771111
Split complementary#441177, #771144
Tetradic#114477, #771177, #774411

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#6AEA6A
Lighter +30%#3EE33E
Lighter +20%#1ED01E
Lighter +10%#17A417
Darker −10%#0B4A0B
Darker −20%#041E04
Darker −30%#000000
Darker −40%#000000
More saturated +25%#008800
Less saturated −25%#226622

Channel breakdown

R17
G119
B17
Red17 (6.7%)
Green119 (46.7%)
Blue17 (6.7%)
Hue120°
Saturation (HSL)75%
Lightness26.67%
Dominant channelGreen
Hex per channelR 11 · G 77 · B 11

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Every value on this page was computed from “171” by Nerdulator’s number engine. Nothing here was retrieved from a database of answers or written by a model.