Recognised as Number
721,133
- Positive
- Odd
- Composite
- 6 digits
721,133 is an odd 6-digit integer and a composite number. It has 6 divisors and a digital root of 8.
Number properties
ParityOddnot divisible by 2
SignPositive
PrimalityComposite
Absolute value721,133
Digit count6
Digit sum17
Digit product126
Multiplicative persistence3times the digit product can be taken before one digit is left
Digital root8repeated digit sum
PalindromicNoreads differently backwards
Happy numberNosquared-digit sums reach 1
Harshad numberNodivisible by its own digit sum
Factors & divisors
Prime factorisation7^2 × 14,717
Distinct prime factors27, 14,717
Number of divisors6
Sum of divisors σ(n)838,926
Aliquot sum117,793sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)618,072integers below n that share no factor with it
Carmichael function λ(n)309,036the smallest exponent with aˣ ≡ 1 for every unit; smaller than φ(n) = 618,072
Möbius function μ(n)0zero, because a prime divides n twice
SquarefreeNohas a repeated prime factor
All divisors1, 7, 49, 14,717, 103,019, 721,1336 in total
Arithmetic
Representations
Decimal721,133
Binary1011000000001110110120 bits
Octal2600355
HexadecimalB00ED
Base 36FGFH
Roman numeralNot defined above 3,999there is no agreed standard notation
In wordsseven hundred and twenty-one thousand, one hundred and thirty-three
Ordinalseven hundred and twenty-one thousand, one hundred and thirty-third
Scientific notation7.21133 × 10^5
Engineering notation721.133 × 10^3
In other bases
Ternary1100122012122base 3; the most digit-efficient integer base after e: 13 digits
Quinary141034013base 5; one hand: 9 digits
Septenary6062300base 7: 7 digits
Nonary1318178base 9; each digit is two ternary digits: 7 digits
Duodecimal2a93a5base 12; divides by 2, 3, 4 and 6, which is why eggs and inches come in twelves: 6 digits
Vigesimal4a2gdbase 20; hands and feet, and the Mayan and Yoruba systems: 5 digits
Sexagesimal3:20:18:53base 60; Babylonian, and still how an hour and a circle are divided: 4 digits
Balanced ternary1101T0T1T0T0Tdigits −1, 0 and +1 written T, 0 and 1; negation is swapping T and 1, so no sign is needed
Negabinary111110000000100111101base −2; place values alternate 1, −2, 4, −8, so every integer has exactly one form without a sign
Bit-level
00000000000010110000000011101101
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
Bytes30b 00 ed
Gray code11101000000010011011n XOR (n >> 1); successive values differ in exactly one bit
At each machine width
32-bit00000000000010110000000011101101
64-bit0000000000000000000000000000000000000000000010110000000011101101
One's complement11111111111101001111111100010010at 32 bits, every bit flipped
Bits reversed10110111000000001101000000000000at 32 bits
Rotated left by 100000000000101100000000111011010at 32 bits, wrapping
Shifted left by 1101100000000111011010= 1,442,266, no wrap
Shifted right by 11011000000001110110= 360,566, discarding the low bit
These bits as a double3.56287041 × 10^-318≈IEEE-754 binary64 reinterpretation of the same 64 bits (subnormal)
Nearest landmarks
Powers & multiples
721,133 to the power 2520,032,803,689
721,133 to the power 3375,012,815,822,659,637
721,133 to the power 4270,434,116,912,642,012,008,721
721,133 to the power 5195,018,966,031,564,272,045,885,000,893
First ten multiples721,133, 1,442,266, 2,163,399, 2,884,532, 3,605,665, 4,326,798, 5,047,931, 5,769,064, 6,490,197, 7,211,330
Powers of twoBetween 2^19 (524,288) and 2^20 (1,048,576)
Divisibility tests
Divisible by 2No, remainder 1
Divisible by 3No, remainder 2
Divisible by 4No, remainder 1
Divisible by 5No, remainder 3
Divisible by 6No, remainder 5
Divisible by 7Yes
Divisible by 8No, remainder 5
Divisible by 9No, remainder 8
Divisible by 10No, remainder 3
Divisible by 11No, remainder 6
Divisible by 12No, remainder 5
Divisible by 100No, remainder 33
Collatz (3n + 1) trajectory
Steps to reach 192the total stopping time
Highest value reached2,163,4003× the starting value
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps721,133 → 2,163,400 → 1,081,700 → 540,850 → 270,425 → 811,276 → 405,638 → 202,819 → 608,458 → 304,229 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage72,113,300%
721,133% as a decimal7,211.33
721,133% of 100721,133
721,133% of 1,0007,211,330
As a fraction of 100721,133/100
Read another way
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Derived from 721,133
Also reads as
#721133 (colour)
- #721133
- Red
- Dark
- Nearest: Brown
#721133 is a red with RGB values 114, 17, 51 and HSL 339°, 74%, 26%. It is a dark colour, so white text on it reaches 11.4:1 contrast (AAA for normal text). The nearest named colour is Brown.
Colour values
#721133#721133
HEX#721133
RGBrgb(114, 17, 51)
RGB (0–1)0.4471, 0.0667, 0.2
RGB percentages44.7%, 6.7%, 20%
HSLhsl(339, 74%, 25.7%)
HSV / HSBhsv(339, 85.1%, 44.7%)
CMYK0%, 85.1%, 55.3%, 55.3%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer7,475,507
CSS custom property--colour: #721133;
Brightness & contrast
Relative luminance0.04217WCAG 2.x, 0 is black and 1 is white
Perceived brightness66 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 11.39:1
Contrast with white11.39:1WCAG normal text: AAA
Contrast with black1.84:1WCAG normal text: Fail
Greyscale equivalent#282828
Inverted#8DEECC
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text11.39:1WCAG large text: AAA
Contrast with black, large text1.84:1WCAG large text: Fail
Named colours
Hue familyred
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#117250
Analogous#721164, #721F11
Triadic#337211, #113372
Split complementary#11721F, #116472
Tetradic#647211, #117250, #1F1172
Tints, shades & saturation
Channel breakdown
R114
G17
B51
Red114 (44.7%)
Green17 (6.7%)
Blue51 (20%)
Hue338.97°
Saturation (HSL)74.05%
Lightness25.69%
Dominant channelRed
Hex per channelR 72 · G 11 · B 33
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