Number
991,001
- Positive
- Odd
- Composite
- 6 digits
991,001 is an odd 6-digit integer and a composite number. It has 8 divisors and a digital root of 2.
Number properties
ParityOddnot divisible by 2
SignPositive
PrimalityComposite
Absolute value991,001
Digit count6
Digit sum20
Digital root2repeated digit sum
PalindromicNoreads differently backwards
Happy numberNosquared-digit sums reach 1
Harshad numberNodivisible by its own digit sum
Factors & divisors
Prime factorisation11 × 23 × 3,917
Distinct prime factors311, 23, 3,917
Number of divisors8
Sum of divisors σ(n)1,128,384
Aliquot sum137,383sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)861,520integers below n that share no factor with it
SquarefreeYesno repeated prime factor
All divisors1, 11, 23, 253, 3,917, 43,087, 90,091, 991,0018 in total
Arithmetic
Representations
Decimal991,001
Binary1111000111110001100120 bits
Octal3617431
HexadecimalF1F19
Base 36L8NT
Roman numeralNot defined above 3,999there is no agreed standard notation
In wordsnine hundred and ninety-one thousand and one
Ordinalnine hundred and ninety-one thousand and first
Scientific notation9.91001 × 10^5
Engineering notation991.001 × 10^3
Nearest landmarks
Powers & multiples
991,001 to the power 2982,082,982,001
991,001 to the power 3973,245,217,245,973,001
991,001 to the power 4964,486,983,535,976,489,964,001
991,001 to the power 5955,807,565,171,136,237,530,814,955,001
First ten multiples991,001, 1,982,002, 2,973,003, 3,964,004, 4,955,005, 5,946,006, 6,937,007, 7,928,008, 8,919,009, 9,910,010
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 1
Divisible by 6No, remainder 5
Divisible by 7No, remainder 4
Divisible by 8No, remainder 1
Divisible by 9No, remainder 2
Divisible by 10No, remainder 1
Divisible by 11Yes
Divisible by 12No, remainder 5
Divisible by 100No, remainder 1
Collatz (3n + 1) trajectory
Steps to reach 1196the total stopping time
Highest value reached6,349,5886× the starting value
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps991,001 → 2,973,004 → 1,486,502 → 743,251 → 2,229,754 → 1,114,877 → 3,344,632 → 1,672,316 → 836,158 → 418,079 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage99,100,100%
991,001% as a decimal9,910.01
991,001% of 100991,001
991,001% of 1,0009,910,010
As a fraction of 100991,001/100
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Derived from 991,001
Also reads as
#991001 (colour)
- #991001
- Red
- Dark
- Nearest: Dark red
#991001 is a red with RGB values 153, 16, 1 and HSL 6°, 99%, 30%. It is a dark colour, so white text on it reaches 8.6:1 contrast (AAA for normal text). The nearest named colour is Dark red.
Colour values
#991001#991001
HEX#991001
RGBrgb(153, 16, 1)
RGB (0–1)0.6, 0.0627, 0.0039
RGB percentages60%, 6.3%, 0.4%
HSLhsl(5.9, 98.7%, 30.2%)
HSV / HSBhsv(5.9, 99.3%, 60%)
CMYK0%, 89.5%, 99.3%, 40%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer10,031,105
CSS custom property--colour: #991001;
Brightness & contrast
Relative luminance0.07145WCAG 2.x, 0 is black and 1 is white
Perceived brightness84.6 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 8.65:1
Contrast with white8.65:1WCAG normal text: AAA
Contrast with black2.43:1WCAG normal text: Fail
Greyscale equivalent#2C2C2C
Inverted#66EFFE
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text8.65:1WCAG large text: AAA
Contrast with black, large text2.43:1WCAG large text: Fail
Named colours
Hue familyred
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#018A99
Analogous#99013E, #995C01
Triadic#019910, #100199
Split complementary#01995C, #013E99
Tetradic#3E9901, #018A99, #5C0199
Tints, shades & saturation
Channel breakdown
R153
G16
B1
Red153 (60%)
Green16 (6.3%)
Blue1 (0.4%)
Hue5.92°
Saturation (HSL)98.7%
Lightness30.2%
Dominant channelRed
Hex per channelR 99 · G 10 · B 01
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