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).
One hundred is the square of 10 (in scientific notation it is written as 102). 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.
The number of pounds in an American short hundredweight.
The number of subunits into which many of the world's currencies are divided; for example, one euro is one hundred cents and one Pound Sterling is one hundred pence.
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