Number
145
- Positive
- Odd
- Composite
- 3 digits
145 is an odd 3-digit integer and a composite number. It has 4 divisors and a digital root of 1.
Number properties
ParityOddnot divisible by 2
SignPositive
PrimalityComposite
Absolute value145
Digit count3
Digit sum10
Digital root1repeated digit sum
PalindromicNoreads differently backwards
Happy numberNosquared-digit sums reach 1
Harshad numberNodivisible by its own digit sum
Factors & divisors
Prime factorisation5 × 29
Distinct prime factors25, 29
Number of divisors4
Sum of divisors σ(n)180
Aliquot sum35sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)112integers below n that share no factor with it
SquarefreeYesno repeated prime factor
All divisors1, 5, 29, 1454 in total
Arithmetic
Representations
Decimal145
Binary100100018 bits
Octal221
Hexadecimal91
Base 3641
Roman numeralCXLV
In wordsone hundred and forty-five
Ordinalone hundred and forty-fifth
Scientific notation1.45 × 10^2
Engineering notation145
Nearest landmarks
Powers & multiples
145 to the power 221,025
145 to the power 33,048,625
145 to the power 4442,050,625
145 to the power 564,097,340,625
First ten multiples145, 290, 435, 580, 725, 870, 1,015, 1,160, 1,305, 1,450
Powers of twoBetween 2^7 (128) and 2^8 (256)
Divisibility tests
Divisible by 2No, remainder 1
Divisible by 3No, remainder 1
Divisible by 4No, remainder 1
Divisible by 5Yes
Divisible by 6No, remainder 1
Divisible by 7No, remainder 5
Divisible by 8No, remainder 1
Divisible by 9No, remainder 1
Divisible by 10No, remainder 5
Divisible by 11No, remainder 2
Divisible by 12No, remainder 1
Divisible by 100No, remainder 45
Collatz (3n + 1) trajectory
Steps to reach 1116the total stopping time
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps145 → 436 → 218 → 109 → 328 → 164 → 82 → 41 → 124 → 62 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage14,500%
145% as a decimal1.45
145% of 100145
145% of 1,0001,450
As a fraction of 100145/100
Read another way
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Derived from 145
Other readings
Also reads as
#114455 (colour)
- #114455
- Cyan
- Dark
- Nearest: Dark slate grey
#114455 is a cyan with RGB values 17, 68, 85 and HSL 195°, 67%, 20%. It is a dark colour, so white text on it reaches 10.6:1 contrast (AAA for normal text). The nearest named colour is Dark slate grey.
Colour values
#114455#114455
HEX#114455
HEX (short)#145
RGBrgb(17, 68, 85)
RGB (0–1)0.0667, 0.2667, 0.3333
RGB percentages6.7%, 26.7%, 33.3%
HSLhsl(195, 66.7%, 20%)
HSV / HSBhsv(195, 80%, 33.3%)
CMYK80%, 20%, 0%, 66.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,131,605
CSS custom property--colour: #114455;
Brightness & contrast
Relative luminance0.04909WCAG 2.x, 0 is black and 1 is white
Perceived brightness60.2 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 10.6:1
Contrast with white10.6:1WCAG normal text: AAA
Contrast with black1.98:1WCAG normal text: Fail
Greyscale equivalent#3A3A3A
Inverted#EEBBAA
Colour vision & accessibility
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text10.6:1WCAG large text: AAA
Contrast with black, large text1.98:1WCAG large text: Fail
Named colours
Hue familycyan
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#552211
Analogous#115544, #112255
Triadic#551144, #445511
Split complementary#551122, #554411
Tetradic#441155, #552211, #225511
Tints, shades & saturation
Channel breakdown
R17
G68
B85
Red17 (6.7%)
Green68 (26.7%)
Blue85 (33.3%)
Hue195°
Saturation (HSL)66.67%
Lightness20%
Dominant channelBlue
Hex per channelR 11 · G 44 · B 55
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Harmonies
Similar named colours
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