100 (number)

100 (the Roman numeral is C for centum) is the natural number following 99 and preceding 101.

In mathematics

One hundred is the square of 10 (in scientific notation it is written as 10^2). The standard SI prefix for a hundred is "hecto-".

Related Topics:
10 - Scientific notation - SI prefix - Hecto

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It is the sum of the first nine prime numbers, as well as the sum of two prime numbers (47 + 53), and the sum of the cubes of the first four integers.

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But perhaps this number is most important as the basis of percentages (literally "per hundred"), with 100% being a full amount.

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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.

Related Topics:
Gonal number - Coprime - Noncototient

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100 is a Harshad number in base 10, and also in base 4, and in that base it is a self-descriptive number.

Related Topics:
Harshad number - Self-descriptive number

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