Number
990,001
- Positive
- Odd
- Prime
- 6 digits
990,001 is an odd 6-digit integer and a prime number. It has 2 divisors and a digital root of 1.
Number properties
ParityOddnot divisible by 2
SignPositive
PrimalityPrime
Absolute value990,001
Digit count6
Digit sum19
Digital root1repeated digit sum
PalindromicNoreads differently backwards
Happy numberNosquared-digit sums reach 1
Harshad numberNodivisible by its own digit sum
Factors & divisors
Prime factorisation990,001
Distinct prime factors1990,001
Number of divisors2
Sum of divisors σ(n)990,002
Aliquot sum1sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)990,000integers below n that share no factor with it
SquarefreeYesno repeated prime factor
All divisors1, 990,0012 in total
Arithmetic
Representations
Decimal990,001
Binary1111000110110011000120 bits
Octal3615461
HexadecimalF1B31
Base 36L7W1
Roman numeralNot defined above 3,999there is no agreed standard notation
In wordsnine hundred and ninety thousand and one
Ordinalnine hundred and ninety thousand and first
Scientific notation9.90001 × 10^5
Engineering notation990.001 × 10^3
Nearest landmarks
Powers & multiples
990,001 to the power 2980,101,980,001
990,001 to the power 3970,301,940,302,970,001
990,001 to the power 4960,599,891,201,880,603,960,001
990,001 to the power 5950,994,852,889,752,999,801,004,950,001
First ten multiples990,001, 1,980,002, 2,970,003, 3,960,004, 4,950,005, 5,940,006, 6,930,007, 7,920,008, 8,910,009, 9,900,010
Powers of twoBetween 2^19 (524,288) and 2^20 (1,048,576)
Divisibility tests
Divisible by 2No, remainder 1
Divisible by 3No, remainder 1
Divisible by 4No, remainder 1
Divisible by 5No, remainder 1
Divisible by 6No, remainder 1
Divisible by 7No, remainder 5
Divisible by 8No, remainder 1
Divisible by 9No, remainder 1
Divisible by 10No, remainder 1
Divisible by 11No, remainder 1
Divisible by 12No, remainder 1
Divisible by 100No, remainder 1
Collatz (3n + 1) trajectory
Steps to reach 1165the total stopping time
Highest value reached2,970,0043× the starting value
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps990,001 → 2,970,004 → 1,485,002 → 742,501 → 2,227,504 → 1,113,752 → 556,876 → 278,438 → 139,219 → 417,658 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage99,000,100%
990,001% as a decimal9,900.01
990,001% of 100990,001
990,001% of 1,0009,900,010
As a fraction of 100990,001/100
Read another way
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Derived from 990,001
Also reads as
#990001 (colour)
- #990001
- Red
- Dark
- Nearest: Dark red
#990001 is a red with RGB values 153, 0, 1 and HSL 360°, 100%, 30%. It is a dark colour, so white text on it reaches 8.9:1 contrast (AAA for normal text). The nearest named colour is Dark red.
Colour values
#990001#990001
HEX#990001
RGBrgb(153, 0, 1)
RGB (0–1)0.6, 0, 0.0039
RGB percentages60%, 0%, 0.4%
HSLhsl(359.6, 100%, 30%)
HSV / HSBhsv(359.6, 100%, 60%)
CMYK0%, 100%, 99.3%, 40%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer10,027,009
CSS custom property--colour: #990001;
Brightness & contrast
Relative luminance0.06774WCAG 2.x, 0 is black and 1 is white
Perceived brightness83.7 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 8.92:1
Contrast with white8.92:1WCAG normal text: AAA
Contrast with black2.35:1WCAG normal text: Fail
Greyscale equivalent#212121
Inverted#66FFFE
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text8.92:1WCAG large text: AAA
Contrast with black, large text2.35:1WCAG large text: Fail
Named colours
Hue familyred
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#009998
Analogous#99004E, #994C00
Triadic#019900, #000199
Split complementary#00994C, #004D99
Tetradic#4D9900, #009998, #4C0099
Tints, shades & saturation
Channel breakdown
R153
G0
B1
Red153 (60%)
Green0 (0%)
Blue1 (0.4%)
Hue359.61°
Saturation (HSL)100%
Lightness30%
Dominant channelRed
Hex per channelR 99 · G 00 · B 01
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