47 (number)
From Halbeeg, the open encyclopedia · Af-Soomaali
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47 is a natural number that falls between 46 and 48. It is written as 47 in the decimal system and is a whole number with no fractional part.
47 is a prime number, meaning only 1 and 47 divide it evenly. It is the fifteenth prime number, counting from 2.
Mathematical properties
In terms of divisibility, the divisors of 47 are only 1 and 47; the sum of its proper divisors is 1, making it a deficient number. 47 is also a Sophie Germain prime: it is a prime number of the form 4k+3, since 47 = 4 × 11 + 3.
In other base systems: 47 can be written in binary as 101111, in octal as 57, and in hexadecimal as 2F. The sum of its decimal digits, 4 + 7, is 11.
General use
47 is used as a counting number and as an ordinal number (forty-seventh). It also serves as a numerical label for identification, for example in road numbers, years, and sports team rosters.