Decimal number
551
- Positive
- Decimal
- 0 d.p.
- Exact fraction
551 is a decimal number equal to 551⁄1. It lies between 551 and 551, and as a percentage it is 55,100%.
Number properties
Fractions & ratios
Arithmetic
Representations
Decimal551
Scientific notation5.51 × 10^2
Exponential5.51e+2
IEEE 754 binary64 (hex)0x4081380000000000the exact 64-bit pattern stored
IEEE 754 binary32 (hex)0x4409C00032-bit single precision, may lose accuracy
Rounding
To 0 decimal places551
To 1 decimal place551.0
To 2 decimal places551.00
To 3 decimal places551.000
To 4 decimal places551.0000
To 1 significant figure600
To 2 significant figures550
To 3 significant figures551
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Also reads as
#551E00 (colour)
- #551E00
- Orange
- Dark
- Nearest: Saddle brown
#551E00 is a orange with RGB values 85, 30, 0 and HSL 21°, 100%, 17%. It is a dark colour, so white text on it reaches 13.4:1 contrast (AAA for normal text). The nearest named colour is Saddle brown.
Colour values
#551E00#551E00
HEX#551E00
RGBrgb(85, 30, 0)
RGB (0–1)0.3333, 0.1176, 0
RGB percentages33.3%, 11.8%, 0%
HSLhsl(21.2, 100%, 16.7%)
HSV / HSBhsv(21.2, 100%, 33.3%)
CMYK0%, 64.7%, 100%, 66.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer5,578,240
CSS custom property--colour: #551E00;
Brightness & contrast
Relative luminance0.0286WCAG 2.x, 0 is black and 1 is white
Perceived brightness51.9 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 13.36:1
Contrast with white13.36:1WCAG normal text: AAA
Contrast with black1.57:1WCAG normal text: Fail
Greyscale equivalent#282828
Inverted#AAE1FF
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text13.36:1WCAG large text: AAA
Contrast with black, large text1.57:1WCAG large text: Fail
Named colours
Hue familyorange
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#003755
Analogous#55000C, #554900
Triadic#00551E, #1E0055
Split complementary#005549, #000C55
Tetradic#0C5500, #003755, #490055
Tints, shades & saturation
Channel breakdown
R85
G30
B0
Red85 (33.3%)
Green30 (11.8%)
Blue0 (0%)
Hue21.18°
Saturation (HSL)100%
Lightness16.67%
Dominant channelRed
Hex per channelR 55 · G 1E · B 00
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