**100** (the Roman numeral is C for *centum*) is the natural number following 99 and preceding 101. Prefixes for 100 include hecta- (Greek) and cent- (Latin). ## 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-". 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. But perhaps this number is most important as the basis of percentages (literally "per hundred"), with 100% being a full amount. One hundred is also an 18-gonal number and a Harshad 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.
## In other fields **One hundred** is also: ## Other numbers in the 100s - One hundred eleven has its own article.
- One hundred seventy four is a semi-meandric number
- One hundred seventy five has its own article.
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