47 (number) This article is about the number 47. For the year, see 47. Forty-seven is a number. It comes between forty-six and forty-eight, and is an odd number. It is also the 15th prime number, after 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, and 43. This short article about mathematics can be made longer. You can help Wikipedia by adding to it.