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Number

671

  • Positive
  • Odd
  • Composite
  • 3 digits

671 is an odd 3-digit integer and a composite number. It has 4 divisors and a digital root of 5.

Number properties

ParityOddnot divisible by 2
SignPositive
PrimalityComposite
Absolute value671
Digit count3
Digit sum14
Digital root5repeated digit sum
PalindromicNoreads differently backwards
Happy numberYessquared-digit sums reach 1
Harshad numberNodivisible by its own digit sum

Factors & divisors

Prime factorisation11 × 61
Distinct prime factors211, 61
Number of divisors4
Sum of divisors σ(n)744
Aliquot sum73sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)600integers below n that share no factor with it
SquarefreeYesno repeated prime factor
All divisors1, 11, 61, 6714 in total

Arithmetic

Previous number670
Next number672
Double1,342
Half335.5
Square450,241
Cube302,111,711
Square root25.903667694≈irrational, shown to 9 decimal places
Cube root8.754691362≈
Negation-671
Reciprocal0.001490313≈
671 factorial1354312250127326150228520755614555676688… (1,608 digits)

Representations

Decimal671
Binary101001111110 bits
Octal1237
Hexadecimal29F
Base 36IN
Roman numeralDCLXXI
In wordssix hundred and seventy-one
Ordinalsix hundred and seventy-first
Scientific notation6.71 × 10^2
Engineering notation671

Nearest landmarks

Next prime673+2
Previous prime661−10
Distance to nearest prime2
Nearest square below625
Nearest square above676

Powers & multiples

671 to the power 2450,241
671 to the power 3302,111,711
671 to the power 4202,716,958,081
671 to the power 5136,023,078,872,351
First ten multiples671, 1,342, 2,013, 2,684, 3,355, 4,026, 4,697, 5,368, 6,039, 6,710
Powers of twoBetween 2^9 (512) and 2^10 (1,024)

Divisibility tests

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

Collatz (3n + 1) trajectory

Steps to reach 195the total stopping time
Highest value reached39,36458× the starting value
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps671 → 2,014 → 1,007 → 3,022 → 1,511 → 4,534 → 2,267 → 6,802 → 3,401 → 10,204 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1

As a percentage & fraction

As a percentage67,100%
671% as a decimal6.71
671% of 100671
671% of 1,0006,710
As a fraction of 100671/100

Read another way

As seconds11 minutes and 11 seconds
As bytes671 B
As a 24-bit colour#00029F

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Neighbouring numbers

Nearby primes

Also reads as

#667711 (colour)

  • #667711
  • Green
  • Dark
  • Nearest: Olivedrab

#667711 is a green with RGB values 102, 119, 17 and HSL 70°, 75%, 27%. It is a dark colour, so white text on it reaches 5:1 contrast (AA for normal text). The nearest named colour is Olivedrab.

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Colour values

#667711#667711
HEX#667711
HEX (short)#671
RGBrgb(102, 119, 17)
RGB (0–1)0.4, 0.4667, 0.0667
RGB percentages40%, 46.7%, 6.7%
HSLhsl(70, 75%, 26.7%)
HSV / HSBhsv(70, 85.7%, 46.7%)
CMYK14.3%, 0%, 85.7%, 53.3%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer6,715,153
CSS custom property--colour: #667711;

Brightness & contrast

Relative luminance0.16059WCAG 2.x, 0 is black and 1 is white
Perceived brightness107 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 4.99:1
Contrast with white4.99:1WCAG normal text: AA
Contrast with black4.21:1WCAG normal text: Fail
Greyscale equivalent#6C6C6C
Inverted#9988EE

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#7F7000no red cones; affects about 1% of men; ΔE 15.9 from the original
Deuteranopia#7D701Cno green cones; the most common form, about 1% of men; ΔE 15.3 from the original
Tritanopia#6D7065no blue cones; rare, and affects men and women equally; ΔE 45.7 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text4.99:1WCAG large text: AAA
Contrast with black, large text4.21:1WCAG large text: AA

Named colours

Olivedrab · ΔE 11.5Olive · ΔE 11.7Dark olivegreen · ΔE 18.4Dark green · ΔE 26.8Dark khaki · ΔE 29.9Forest green · ΔE 30.3
Nearest named CSS colourOlivedrab (#6B8E23)ΔE 11.49, a distinctly different colour
Hue familygreen
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#221177
Analogous#775511, #337711
Triadic#116677, #771166
Split complementary#113377, #551177
Tetradic#117755, #221177, #771133

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#D4EA6A
Lighter +30%#C8E33E
Lighter +20%#B3D01E
Lighter +10%#8CA417
Darker −10%#404A0B
Darker −20%#191E04
Darker −30%#000000
Darker −40%#000000
More saturated +25%#718800
Less saturated −25%#5B6622

Channel breakdown

R102
G119
B17
Red102 (40%)
Green119 (46.7%)
Blue17 (6.7%)
Hue70°
Saturation (HSL)75%
Lightness26.67%
Dominant channelGreen
Hex per channelR 66 · G 77 · B 11

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Every value on this page was computed from “671” by Nerdulator’s number engine. Nothing here was retrieved from a database of answers or written by a model.