100

100 or one hundred (Roman numeral: C)[1] is the natural number following 99 and preceding 101.

100 is the basis of percentages (per centum meaning "by the hundred" in Latin), with 100% being a full amount.

[5] 100 cannot be expressed as the difference between any integer and the total of coprimes below it, making it a noncototient.

[10] This is related by Nicomachus's theorem to the fact that 100 also equals the square of the sum of the first four positive integers: 100 = 102 = (1 + 2 + 3 + 4)2.

By specification, 100 euro notes feature a picture of a Rococo gateway on the obverse and a Baroque bridge on the reverse.