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Number

825

  • Positive
  • Odd
  • Composite
  • 3 digits

825 is an odd 3-digit integer and a composite number. It has 12 divisors and a digital root of 6.

Number properties

ParityOddnot divisible by 2
SignPositive
PrimalityComposite
Absolute value825
Digit count3
Digit sum15
Digital root6repeated digit sum
PalindromicNoreads differently backwards
Happy numberNosquared-digit sums reach 1
Harshad numberYesdivisible by its own digit sum

Factors & divisors

Prime factorisation3 × 5^2 × 11
Distinct prime factors33, 5, 11
Number of divisors12
Sum of divisors σ(n)1,488
Aliquot sum663sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)400integers below n that share no factor with it
SquarefreeNohas a repeated prime factor
All divisors1, 3, 5, 11, 15, 25, 33, 55, 75, 165, 275, 82512 in total

Arithmetic

Previous number824
Next number826
Double1,650
Half412.5
Square680,625
Cube561,515,625
Square root28.722813233≈irrational, shown to 9 decimal places
Cube root9.378887277≈
Negation-825
Reciprocal0.0012121212≈
825 factorial4354324188998942987583867298502785113323… (2,050 digits)

Representations

Decimal825
Binary110011100110 bits
Octal1471
Hexadecimal339
Base 36MX
Roman numeralDCCCXXV
In wordseight hundred and twenty-five
Ordinaleight hundred and twenty-fifth
Scientific notation8.25 × 10^2
Engineering notation825

Nearest landmarks

Next prime827+2
Previous prime823−2
Distance to nearest prime2
Nearest square below784
Nearest square above841

Powers & multiples

825 to the power 2680,625
825 to the power 3561,515,625
825 to the power 4463,250,390,625
825 to the power 5382,181,572,265,625
First ten multiples825, 1,650, 2,475, 3,300, 4,125, 4,950, 5,775, 6,600, 7,425, 8,250
Powers of twoBetween 2^9 (512) and 2^10 (1,024)

Divisibility tests

Divisible by 2No, remainder 1
Divisible by 3Yes
Divisible by 4No, remainder 1
Divisible by 5Yes
Divisible by 6No, remainder 3
Divisible by 7No, remainder 6
Divisible by 8No, remainder 1
Divisible by 9No, remainder 6
Divisible by 10No, remainder 5
Divisible by 11Yes
Divisible by 12No, remainder 9
Divisible by 100No, remainder 25

Collatz (3n + 1) trajectory

Steps to reach 1134the total stopping time
Highest value reached9,23211× the starting value
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps825 → 2,476 → 1,238 → 619 → 1,858 → 929 → 2,788 → 1,394 → 697 → 2,092 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1

As a percentage & fraction

As a percentage82,500%
825% as a decimal8.25
825% of 100825
825% of 1,0008,250
As a fraction of 100825/100

Read another way

As seconds13 minutes and 45 seconds
As bytes825 B
As a 24-bit colour#000339

Keep nerding

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Neighbouring numbers

Nearby primes

Also reads as

#882255 (colour)

  • #882255
  • Red
  • Dark
  • Nearest: Medium violet red

#882255 is a red with RGB values 136, 34, 85 and HSL 330°, 60%, 33%. It is a dark colour, so white text on it reaches 8.7:1 contrast (AAA for normal text). The nearest named colour is Medium violet red.

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Colour values

#882255#882255
HEX#882255
HEX (short)#825
RGBrgb(136, 34, 85)
RGB (0–1)0.5333, 0.1333, 0.3333
RGB percentages53.3%, 13.3%, 33.3%
HSLhsl(330, 60%, 33.3%)
HSV / HSBhsv(330, 75%, 53.3%)
CMYK0%, 75%, 37.5%, 46.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer8,921,685
CSS custom property--colour: #882255;

Brightness & contrast

Relative luminance0.07034WCAG 2.x, 0 is black and 1 is white
Perceived brightness83.9 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 8.73:1
Contrast with white8.73:1WCAG normal text: AAA
Contrast with black2.41:1WCAG normal text: Fail
Greyscale equivalent#3B3B3B
Inverted#77DDAA

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#353F56no red cones; affects about 1% of men; ΔE 45.9 from the original
Deuteranopia#525253no green cones; the most common form, about 1% of men; ΔE 47.1 from the original
Tritanopia#931838no blue cones; rare, and affects men and women equally; ΔE 20 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text8.73:1WCAG large text: AAA
Contrast with black, large text2.41:1WCAG large text: Fail

Named colours

Medium violet red · ΔE 28.9Pale violetred · ΔE 29.3Purple · ΔE 33.3Indian red · ΔE 35.1Brown · ΔE 36.6Dark magenta · ΔE 36.7
Nearest named CSS colourMedium violet red (#C71585)ΔE 28.94, a distinctly different colour
Hue familyred
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#228855
Analogous#882288, #882222
Triadic#558822, #225588
Split complementary#228822, #228888
Tetradic#888822, #228855, #222288

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#E492BB
Lighter +30%#DA69A2
Lighter +20%#CF4188
Lighter +10%#B12C6E
Darker −10%#5F183B
Darker −20%#360E22
Darker −30%#0E0308
Darker −40%#000000
More saturated +25%#9D0D55
Less saturated −25%#733755

Channel breakdown

R136
G34
B85
Red136 (53.3%)
Green34 (13.3%)
Blue85 (33.3%)
Hue330°
Saturation (HSL)60%
Lightness33.33%
Dominant channelRed
Hex per channelR 88 · G 22 · B 55

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Every value on this page was computed from “825” by Nerdulator’s number engine. Nothing here was retrieved from a database of answers or written by a model.