Number
1,550
- Positive
- Even
- Composite
- 4 digits
1,550 is an even 4-digit integer and a composite number. It has 12 divisors and a digital root of 2.
Number properties
ParityEvendivisible by 2
SignPositive
PrimalityComposite
Absolute value1,550
Digit count4
Digit sum11
Digital root2repeated digit sum
PalindromicNoreads differently backwards
Happy numberNosquared-digit sums reach 1
Harshad numberNodivisible by its own digit sum
Factors & divisors
Prime factorisation2 × 5^2 × 31
Distinct prime factors32, 5, 31
Number of divisors12
Sum of divisors σ(n)2,976
Aliquot sum1,426sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)600integers below n that share no factor with it
SquarefreeNohas a repeated prime factor
All divisors1, 2, 5, 10, 25, 31, 50, 62, 155, 310, 775, 1,55012 in total
Arithmetic
Representations
Decimal1,550
Binary1100000111011 bits
Octal3016
Hexadecimal60E
Base 36172
Roman numeralMDL
In wordsone thousand, five hundred and fifty
Ordinalone thousand, five hundred and fiftieth
Scientific notation1.55 × 10^3
Engineering notation1.55 × 10^3
Nearest landmarks
Powers & multiples
1,550 to the power 22,402,500
1,550 to the power 33,723,875,000
1,550 to the power 45,772,006,250,000
1,550 to the power 58,946,609,687,500,000
First ten multiples1,550, 3,100, 4,650, 6,200, 7,750, 9,300, 10,850, 12,400, 13,950, 15,500
Powers of twoBetween 2^10 (1,024) and 2^11 (2,048)
Divisibility tests
Divisible by 2Yes
Divisible by 3No, remainder 2
Divisible by 4No, remainder 2
Divisible by 5Yes
Divisible by 6No, remainder 2
Divisible by 7No, remainder 3
Divisible by 8No, remainder 6
Divisible by 9No, remainder 2
Divisible by 10Yes
Divisible by 11No, remainder 10
Divisible by 12No, remainder 2
Divisible by 100No, remainder 50
Collatz (3n + 1) trajectory
Steps to reach 1153the total stopping time
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps1,550 → 775 → 2,326 → 1,163 → 3,490 → 1,745 → 5,236 → 2,618 → 1,309 → 3,928 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage155,000%
1,550% as a decimal15.5
1,550% of 1001,550
1,550% of 1,00015,500
As a fraction of 1001,550/100
Read another way
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Derived from 1,550
Also reads as
1550 (year)
- Common year
- 365 days
- 16th century
- Dog
1550 was a common year of 365 days. It began on a Sunday and ended on a Sunday. Easter Sunday fell on 16 April.
Structure of the year
Months of 1550
January31 days, starts Sunday
February28 days, starts Wednesday
August31 days, starts Tuesday
September30 days, starts Friday
October31 days, starts Sunday
November30 days, starts Wednesday
December31 days, starts Friday
Time references
These values depend on today’s date and change daily.
Unix timestamp at the start-13,253,932,800
Unix timestamp at the end-13,222,396,801
Years from now476 years ago
Days from today174,107 days since 1 January
The number 1550
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Also reads as
#115555 (colour)
- #115555
- Cyan
- Dark
- Nearest: Dark slate grey
#115555 is a cyan with RGB values 17, 85, 85 and HSL 180°, 67%, 20%. 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 slate grey.
Colour values
#115555#115555
HEX#115555
HEX (short)#155
RGBrgb(17, 85, 85)
RGB (0–1)0.0667, 0.3333, 0.3333
RGB percentages6.7%, 33.3%, 33.3%
HSLhsl(180, 66.7%, 20%)
HSV / HSBhsv(180, 80%, 33.3%)
CMYK80%, 0%, 0%, 66.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,135,957
CSS custom property--colour: #115555;
Brightness & contrast
Relative luminance0.07272WCAG 2.x, 0 is black and 1 is white
Perceived brightness71.8 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 8.56:1
Contrast with white8.56:1WCAG normal text: AAA
Contrast with black2.45:1WCAG normal text: Fail
Greyscale equivalent#474747
Inverted#EEAAAA
Colour vision & accessibility
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text8.56:1WCAG large text: AAA
Contrast with black, large text2.45:1WCAG large text: Fail
Named colours
Hue familycyan
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#551111
Analogous#115533, #113355
Triadic#551155, #555511
Split complementary#551133, #553311
Tetradic#331155, #551111, #335511
Tints, shades & saturation
Channel breakdown
R17
G85
B85
Red17 (6.7%)
Green85 (33.3%)
Blue85 (33.3%)
Hue180°
Saturation (HSL)66.67%
Lightness20%
Dominant channelGreen and Blue
Hex per channelR 11 · G 55 · B 55
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