Recognised as Number
355
- Positive
- Odd
- Composite
- 3 digits
355 is an odd 3-digit integer and a composite number. It has 4 divisors and a digital root of 4.
Number properties
ParityOddnot divisible by 2
SignPositive
PrimalityComposite
Absolute value355
Digit count3
Digit sum13
Digit product75
Multiplicative persistence4times the digit product can be taken before one digit is left
Digital root4repeated digit sum
PalindromicNoreads differently backwards
Happy numberNosquared-digit sums reach 1
Harshad numberNodivisible by its own digit sum
Factors & divisors
Prime factorisation5 × 71
Distinct prime factors25, 71
Number of divisors4
Sum of divisors σ(n)432
Aliquot sum77sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)280integers below n that share no factor with it
Carmichael function λ(n)140the smallest exponent with aˣ ≡ 1 for every unit; smaller than φ(n) = 280
Möbius function μ(n)+12 distinct prime factors, an even number of them
SquarefreeYesno repeated prime factor
All divisors1, 5, 71, 3554 in total
Arithmetic
Representations
Decimal355
Binary1011000119 bits
Octal543
Hexadecimal163
Base 369V
Roman numeralCCCLV
In wordsthree hundred and fifty-five
Ordinalthree hundred and fifty-fifth
Scientific notation3.55 × 10^2
Engineering notation355
In other bases
Ternary111011base 3; the most digit-efficient integer base after e: 6 digits
Quinary2410base 5; one hand: 4 digits
Septenary1015base 7: 4 digits
Nonary434base 9; each digit is two ternary digits: 3 digits
Duodecimal257base 12; divides by 2, 3, 4 and 6, which is why eggs and inches come in twelves: 3 digits
Vigesimalhfbase 20; hands and feet, and the Mayan and Yoruba systems: 2 digits
Sexagesimal5:55base 60; Babylonian, and still how an hour and a circle are divided: 2 digits
Balanced ternary111011digits −1, 0 and +1 written T, 0 and 1; negation is swapping T and 1, so no sign is needed
Negabinary11010100111base −2; place values alternate 1, −2, 4, −8, so every integer has exactly one form without a sign
Bit-level
0000000101100011
Bit length9 bitsto write the magnitude
Set bits5the population count, or Hamming weight
Zero bits4within that length
Bit parityodd5 set bits, so odd; not the same as the number itself being odd
Highest set bitbit 8worth 256
Lowest set bitbit 00 trailing zeros
Power of twoNo
Bytes201 63
Gray code111010010n XOR (n >> 1); successive values differ in exactly one bit
At each machine width
16-bit0000000101100011
32-bit00000000000000000000000101100011
64-bit0000000000000000000000000000000000000000000000000000000101100011
One's complement1111111010011100at 16 bits, every bit flipped
Bits reversed1100011010000000at 16 bits
Rotated left by 10000001011000110at 16 bits, wrapping
Shifted left by 11011000110= 710, no wrap
Shifted right by 110110001= 177, discarding the low bit
These bits as a double1.75393304 × 10^-321≈IEEE-754 binary64 reinterpretation of the same 64 bits (subnormal)
Nearest landmarks
Powers & multiples
355 to the power 2126,025
355 to the power 344,738,875
355 to the power 415,882,300,625
355 to the power 55,638,216,721,875
First ten multiples355, 710, 1,065, 1,420, 1,775, 2,130, 2,485, 2,840, 3,195, 3,550
Powers of twoBetween 2^8 (256) and 2^9 (512)
Divisibility tests
Divisible by 2No, remainder 1
Divisible by 3No, remainder 1
Divisible by 4No, remainder 3
Divisible by 5Yes
Divisible by 6No, remainder 1
Divisible by 7No, remainder 5
Divisible by 8No, remainder 3
Divisible by 9No, remainder 4
Divisible by 10No, remainder 5
Divisible by 11No, remainder 3
Divisible by 12No, remainder 7
Divisible by 100No, remainder 55
Collatz (3n + 1) trajectory
Steps to reach 132the total stopping time
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps355 → 1,066 → 533 → 1,600 → 800 → 400 → 200 → 100 → 50 → 25 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage35,500%
355% as a decimal3.55
355% of 100355
355% of 1,0003,550
As a fraction of 100355/100
Read another way
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Derived from 355
Other readings
Also reads as
#335555 (colour)
- #335555
- Cyan
- Dark
- Nearest: Dark slate grey
#335555 is a cyan with RGB values 51, 85, 85 and HSL 180°, 25%, 27%. It is a dark colour, so white text on it reaches 8.2:1 contrast (AAA for normal text). The nearest named colour is Dark slate grey.
Colour values
#335555#335555
HEX#335555
HEX (short)#355
RGBrgb(51, 85, 85)
RGB (0–1)0.2, 0.3333, 0.3333
RGB percentages20%, 33.3%, 33.3%
HSLhsl(180, 25%, 26.7%)
HSV / HSBhsv(180, 40%, 33.3%)
CMYK40%, 0%, 0%, 66.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer3,364,181
CSS custom property--colour: #335555;
Brightness & contrast
Relative luminance0.07857WCAG 2.x, 0 is black and 1 is white
Perceived brightness76.4 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 8.17:1
Contrast with white8.17:1WCAG normal text: AAA
Contrast with black2.57:1WCAG normal text: Fail
Greyscale equivalent#4E4E4E
Inverted#CCAAAA
Colour vision & accessibility
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text8.17:1WCAG large text: AAA
Contrast with black, large text2.57:1WCAG large text: Fail
Named colours
Hue familycyan
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#553333
Analogous#335544, #334455
Triadic#553355, #555533
Split complementary#553344, #554433
Tetradic#443355, #553333, #445533
Tints, shades & saturation
Channel breakdown
R51
G85
B85
Red51 (20%)
Green85 (33.3%)
Blue85 (33.3%)
Hue180°
Saturation (HSL)25%
Lightness26.67%
Dominant channelGreen and Blue
Hex per channelR 33 · G 55 · B 55
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Harmonies
Similar named colours
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