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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).
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| Cardinal | one hundred | ||
| Ordinal | 100th (one hundredth) | ||
| Factorization | |||
| Divisors | 2, 4, 5, 10, 20, 25, 50 | ||
| Roman numeral | C | ||
| BinaryThe binary or base-two numeral system is a system for representing numbers in which a radix of two is used; that is, each digit in a binary numeral may have either of two different values. Typically, the symbols 0 and 1 are used to represent binary number | 1100100 | ||
| HexadecimalIn mathematics, hexadecimal or simply hex is a numeral system with a radix or base of 16 , usually written using the symbols 0-9 and A-F or a-f. It is a useful system in computers because there is an easy mapping from four bits to a single hex digit. | 64 | ||
One hundred is the square of 10 (in scientific notationScientific notation standard index notation is floating-point notation with radix (base) 10. It is a concise way of recording numbers using integer powers of ten, that is used to record numbers which are notably large or small. Nonzero numbers are written it is written as ). The standard SI prefixAn SI prefix is a prefix which can be applied to any unit of the International System of Units ( SI) to give subdivisions and multiples of that unit. As part of the SI system they are officially determined by the Bureau International des Poids et Mesures. for a hundred is " hectoHecto (symbol h is a SI prefix in the SI system of units denoting a factor of 102 (100). Adopted in 1795, it comes from the Greek , meaning hundred''. For example: hectare, 100 ares See also SI prefix SI prefixes.-".
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 percentA percentage is a way of expressing a proportion or a fraction as a whole number. A number such as "45%" ("45 percent" or "45 per cent") is actually shorthand for the fraction 45/100. In British English, percent is often written as two words per cent , anages (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.