47215251 has 16 divisors (see below), whose sum is σ = 72990720. Its totient is φ = 30107880.

The previous prime is 47215243. The next prime is 47215261. The reversal of 47215251 is 15251274.

It is not a de Polignac number, because 47215251 - 2³ = 47215243 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (47215211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37395 + ... + 38636.

It is an arithmetic number, because the mean of its divisors is an integer number (4561920).

Almost surely, 2^47215251 is an apocalyptic number.

47215251 is a deficient number, since it is larger than the sum of its proper divisors (25775469).

47215251 is a wasteful number, since it uses less digits than its factorization.

47215251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76063 (or 76057 counting only the distinct ones).

The product of its digits is 2800, while the sum is 27.

The square root of 47215251 is about 6871.3354597196. The cubic root of 47215251 is about 361.4326935177.

The spelling of 47215251 in words is "forty-seven million, two hundred fifteen thousand, two hundred fifty-one".