51631515 has 24 divisors (see below), whose sum is σ = 96379920. Its totient is φ = 25418304.

The previous prime is 51631501. The next prime is 51631537. The reversal of 51631515 is 51513615.

It is not a de Polignac number, because 51631515 - 2⁵ = 51631483 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 43545 + ... + 44714.

It is an arithmetic number, because the mean of its divisors is an integer number (4015830).

Almost surely, 2^51631515 is an apocalyptic number.

51631515 is a deficient number, since it is larger than the sum of its proper divisors (44748405).

51631515 is a wasteful number, since it uses less digits than its factorization.

51631515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88283 (or 88280 counting only the distinct ones).

The product of its digits is 2250, while the sum is 27.

The square root of 51631515 is about 7185.5072889811. The cubic root of 51631515 is about 372.3673746734.

The spelling of 51631515 in words is "fifty-one million, six hundred thirty-one thousand, five hundred fifteen".