Recognised as Number
801,031
- Positive
- Odd
- Composite
- 6 digits
801,031 is an odd 6-digit integer and a composite number. It has 16 divisors and a digital root of 4.
Number properties
ParityOddnot divisible by 2
SignPositive
PrimalityComposite
Absolute value801,031
Digit count6
Digit sum13
Digit product0zero, because one of the digits is zero
Multiplicative persistence1times the digit product can be taken before one digit is left
Digital root4repeated digit sum
PalindromicNoreads differently backwards
Happy numberNosquared-digit sums reach 1
Harshad numberNodivisible by its own digit sum
Factors & divisors
Prime factorisation7 × 11 × 101 × 103
Distinct prime factors47, 11, 101, 103
Number of divisors16
Sum of divisors σ(n)1,018,368
Aliquot sum217,337sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)612,000integers below n that share no factor with it
Carmichael function λ(n)5,100the smallest exponent with aˣ ≡ 1 for every unit; smaller than φ(n) = 612,000
Möbius function μ(n)+14 distinct prime factors, an even number of them
SquarefreeYesno repeated prime factor
All divisors1, 7, 11, 77, 101, 103, 707, 721, 1,111, 1,133, 7,777, 7,931, 10,403, 72,821, 114,433, 801,03116 in total
Arithmetic
Representations
Decimal801,031
Binary1100001110010000011120 bits
Octal3034407
HexadecimalC3907
Base 36H62V
Roman numeralNot defined above 3,999there is no agreed standard notation
In wordseight hundred and one thousand and thirty-one
Ordinaleight hundred and one thousand and thirty-first
Scientific notation8.01031 × 10^5
Engineering notation801.031 × 10^3
In other bases
Ternary1111200210211base 3; the most digit-efficient integer base after e: 13 digits
Quinary201113111base 5; one hand: 9 digits
Septenary6544240base 7: 7 digits
Nonary1450724base 9; each digit is two ternary digits: 7 digits
Duodecimal327687base 12; divides by 2, 3, 4 and 6, which is why eggs and inches come in twelves: 6 digits
Vigesimal502bbbase 20; hands and feet, and the Mayan and Yoruba systems: 5 digits
Sexagesimal3:42:30:31base 60; Babylonian, and still how an hour and a circle are divided: 4 digits
Balanced ternary1TTTTT01T11T11digits −1, 0 and +1 written T, 0 and 1; negation is swapping T and 1, so no sign is needed
Negabinary111000100100100011011base −2; place values alternate 1, −2, 4, −8, so every integer has exactly one form without a sign
Bit-level
00000000000011000011100100000111
Bit length20 bitsto write the magnitude
Set bits9the population count, or Hamming weight
Zero bits11within that length
Bit parityodd9 set bits, so odd; not the same as the number itself being odd
Highest set bitbit 19worth 524,288
Lowest set bitbit 00 trailing zeros
Power of twoNo
Bytes30c 39 07
Gray code10100010010110000100n XOR (n >> 1); successive values differ in exactly one bit
At each machine width
32-bit00000000000011000011100100000111
64-bit0000000000000000000000000000000000000000000011000011100100000111
One's complement11111111111100111100011011111000at 32 bits, every bit flipped
Bits reversed11100000100111000011000000000000at 32 bits
Rotated left by 100000000000110000111001000001110at 32 bits, wrapping
Shifted left by 1110000111001000001110= 1,602,062, no wrap
Shifted right by 11100001110010000011= 400,515, discarding the low bit
These bits as a double3.95761898 × 10^-318≈IEEE-754 binary64 reinterpretation of the same 64 bits (subnormal)
Nearest landmarks
Powers & multiples
801,031 to the power 2641,650,662,961
801,031 to the power 3513,982,072,202,312,791
801,031 to the power 4411,715,573,278,290,817,287,521
801,031 to the power 5329,796,937,378,682,571,662,640,234,151
First ten multiples801,031, 1,602,062, 2,403,093, 3,204,124, 4,005,155, 4,806,186, 5,607,217, 6,408,248, 7,209,279, 8,010,310
Powers of twoBetween 2^19 (524,288) and 2^20 (1,048,576)
Divisibility tests
Divisible by 2No, remainder 1
Divisible by 3No, remainder 1
Divisible by 4No, remainder 3
Divisible by 5No, remainder 1
Divisible by 6No, remainder 1
Divisible by 7Yes
Divisible by 8No, remainder 7
Divisible by 9No, remainder 4
Divisible by 10No, remainder 1
Divisible by 11Yes
Divisible by 12No, remainder 7
Divisible by 100No, remainder 31
Collatz (3n + 1) trajectory
Steps to reach 1100the total stopping time
Highest value reached5,406,9646× the starting value
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps801,031 → 2,403,094 → 1,201,547 → 3,604,642 → 1,802,321 → 5,406,964 → 2,703,482 → 1,351,741 → 4,055,224 → 2,027,612 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage80,103,100%
801,031% as a decimal8,010.31
801,031% of 100801,031
801,031% of 1,0008,010,310
As a fraction of 100801,031/100
Read another way
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Derived from 801,031
Also reads as
#801031 (colour)
- #801031
- Red
- Dark
- Nearest: Brown
#801031 is a red with RGB values 128, 16, 49 and HSL 342°, 78%, 28%. It is a dark colour, so white text on it reaches 10.3:1 contrast (AAA for normal text). The nearest named colour is Brown.
Colour values
#801031#801031
HEX#801031
RGBrgb(128, 16, 49)
RGB (0–1)0.502, 0.0627, 0.1922
RGB percentages50.2%, 6.3%, 19.2%
HSLhsl(342.3, 77.8%, 28.2%)
HSV / HSBhsv(342.3, 87.5%, 50.2%)
CMYK0%, 87.5%, 61.7%, 49.8%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer8,392,753
CSS custom property--colour: #801031;
Brightness & contrast
Relative luminance0.05182WCAG 2.x, 0 is black and 1 is white
Perceived brightness73 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 10.31:1
Contrast with white10.31:1WCAG normal text: AAA
Contrast with black2.04:1WCAG normal text: Fail
Greyscale equivalent#2A2A2A
Inverted#7FEFCE
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text10.31:1WCAG large text: AAA
Contrast with black, large text2.04:1WCAG large text: Fail
Named colours
Hue familyred
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#10805F
Analogous#801069, #802710
Triadic#318010, #103180
Split complementary#108027, #106980
Tetradic#698010, #10805F, #271080
Tints, shades & saturation
Channel breakdown
R128
G16
B49
Red128 (50.2%)
Green16 (6.3%)
Blue49 (19.2%)
Hue342.32°
Saturation (HSL)77.78%
Lightness28.24%
Dominant channelRed
Hex per channelR 80 · G 10 · B 31
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