100 (one hundred) (the Roman numeral is C for centum) is the natural number following 99 and preceding 101.
← 100 101 102 103 104 105 106 107 108 109 →
← 100 110 120 130 140 150 160 170 180 190 →
One hundred is the square of 10 (in scientific notation it is written as 102). The standard SI prefix for a hundred is "hecto-".
One hundred is the basis of percentages (literally "per hundred"), with 100% being a full amount.
It is the sum of the first nine prime numbers, as well as the sum of two prime numbers (47 + 53, 17 +83, 3 + 97, 41 + 59), and the sum of the cubes of the first four integers (100 = 13 + 23 + 33 + 43). Also, 26 + 62 = 100, thus 100 is a Leyland number.
One hundred is also an 18-gonal number. It is divisible by the number of primes below it, 25 in this case. But it can not be expressed as the difference between any integer and the total of coprimes below it, making it a noncototient. However, it can be expressed as a sum of some of its divisors, making it a semiperfect number.
100 is a Harshad number in base 10, and also in base 4, and in that base it is a self-descriptive number.
The Messier object M100, a magnitude 10.5 spiral galaxy in the constellation Coma Berenices.
The New General Catalogue object NGC 100, a magnitude 13.3 spiral galaxy in the constellation Pisces.
The Saros number of the solar eclipse series which began on 264 May 13 and ended on 1526 June 10 with a duration of 1262.1 years and 71 solar eclipses. Further, the number of the lunar eclipse series which began on 403 November 15 and ended on 1864 April 22 with a duration of 1460.4 years, and 82 lunar eclipses.
One hundred is also:
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