Number
201
- Positive
- Odd
- Composite
- 3 digits
201 is an odd 3-digit integer and a composite number. It has 4 divisors and a digital root of 3.
Number properties
ParityOddnot divisible by 2
SignPositive
PrimalityComposite
Absolute value201
Digit count3
Digit sum3
Digital root3repeated digit sum
PalindromicNoreads differently backwards
Happy numberNosquared-digit sums reach 1
Harshad numberYesdivisible by its own digit sum
Factors & divisors
Prime factorisation3 × 67
Distinct prime factors23, 67
Number of divisors4
Sum of divisors σ(n)272
Aliquot sum71sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)132integers below n that share no factor with it
SquarefreeYesno repeated prime factor
All divisors1, 3, 67, 2014 in total
Arithmetic
Representations
Decimal201
Binary110010018 bits
Octal311
HexadecimalC9
Base 365L
Roman numeralCCI
In wordstwo hundred and one
Ordinaltwo hundred and first
Scientific notation2.01 × 10^2
Engineering notation201
Nearest landmarks
Powers & multiples
201 to the power 240,401
201 to the power 38,120,601
201 to the power 41,632,240,801
201 to the power 5328,080,401,001
First ten multiples201, 402, 603, 804, 1,005, 1,206, 1,407, 1,608, 1,809, 2,010
Powers of twoBetween 2^7 (128) and 2^8 (256)
Divisibility tests
Divisible by 2No, remainder 1
Divisible by 3Yes
Divisible by 4No, remainder 1
Divisible by 5No, remainder 1
Divisible by 6No, remainder 3
Divisible by 7No, remainder 5
Divisible by 8No, remainder 1
Divisible by 9No, remainder 3
Divisible by 10No, remainder 1
Divisible by 11No, remainder 3
Divisible by 12No, remainder 9
Divisible by 100No, remainder 1
Collatz (3n + 1) trajectory
Steps to reach 118the total stopping time
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps201 → 604 → 302 → 151 → 454 → 227 → 682 → 341 → 1,024 → 512 → …
Last steps… → 32 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage20,100%
201% as a decimal2.01
201% of 100201
201% of 1,0002,010
As a fraction of 100201/100
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Derived from 201
Other readings
Also reads as
#220011 (colour)
- #220011
- Red
- Dark
- Nearest: Black
#220011 is a red with RGB values 34, 0, 17 and HSL 330°, 100%, 7%. It is a dark colour, so white text on it reaches 19.5:1 contrast (AAA for normal text). The nearest named colour is Black.
Colour values
#220011#220011
HEX#220011
HEX (short)#201
RGBrgb(34, 0, 17)
RGB (0–1)0.1333, 0, 0.0667
RGB percentages13.3%, 0%, 6.7%
HSLhsl(330, 100%, 6.7%)
HSV / HSBhsv(330, 100%, 13.3%)
CMYK0%, 100%, 50%, 86.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,228,241
CSS custom property--colour: #220011;
Brightness & contrast
Relative luminance0.00381WCAG 2.x, 0 is black and 1 is white
Perceived brightness19.5 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 19.51:1
Contrast with white19.51:1WCAG normal text: AAA
Contrast with black1.08:1WCAG normal text: Fail
Greyscale equivalent#080808
Inverted#DDFFEE
Colour vision & accessibility
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text19.51:1WCAG large text: AAA
Contrast with black, large text1.08:1WCAG large text: Fail
Named colours
Hue familyred
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#002211
Analogous#220022, #220000
Triadic#112200, #001122
Split complementary#002200, #002222
Tetradic#222200, #002211, #000022
Tints, shades & saturation
Channel breakdown
R34
G0
B17
Red34 (13.3%)
Green0 (0%)
Blue17 (6.7%)
Hue330°
Saturation (HSL)100%
Lightness6.67%
Dominant channelRed
Hex per channelR 22 · G 00 · B 11
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Harmonies
Similar named colours
Also reads as
HTTP 201 Created (http status)
- 201 Created
- Success
- RFC 9110
HTTP 201 Created is a success response: the request succeeded and created a new resource. It is defined in RFC 9110, and the request was received, understood and accepted.
What it means
Status code201
Reason phraseCreatedadvisory only; clients must not depend on the wording
Class2xx Success
MeaningThe request succeeded and created a new resource
Defined inRFC 9110
Cacheable by defaultNoonly cacheable if the response says so explicitly
How clients behave
Indicates an errorNo
Whose faultNeither, it succeeded
Body expectedUsually
The 2xx class
Class meaningThe request was received, understood and accepted
Codes in this class10
Lowest in class200
Highest in class226
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