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25 is the sum of the five consecutive single-digit odd natural numbers 1, 3, 5, 7, and 9. 25 is a centered octagonal number, [1] a centered square number, [2] a centered octahedral number, [3] and an automorphic number. [4] 25 percent (%) is equal to 1 / 4 . It is the smallest decimal Friedman number as it can be expressed by its own ...
After 1 and 9, 225 is the third smallest number n for which σ(φ(n)) = φ(σ(n)), where σ is the sum of divisors function and φ is Euler's totient function. [8] 225 is a refactorable number. [9] 225 is the smallest square number to have one of every digit in some number base (225 is 3201 in base 4) [10] 225 is the first odd number with ...
A list of articles about numbers (not about numerals). Topics include powers of ten, notable integers, prime and cardinal numbers, and the myriad system.
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Twenty-Five or 25 may refer to: 25 (number) one of the years 25 BC, AD 25, 1925, 2025; Science. Manganese, a transition metal in the periodic table;
Another common usage is to write out any number that can be expressed as one or two words, and use figures otherwise. Examples: "There are six million dogs." (Preferred) "There are 6,000,000 dogs." "That is one hundred and twenty-five oranges." (British English) "That is one hundred twenty-five oranges." (US-American English) "That is 125 oranges."
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A prime number (or prime) is a natural number greater than 1 that has no positive divisors other than 1 and ... 25 p − 1 ≡ 1 (mod p 2): 2, 20771, 40487, 53471161, ...