51321915 has 12 divisors (see below), whose sum is σ = 88958064. Its totient is φ = 27371664.

The previous prime is 51321883. The next prime is 51321931. The reversal of 51321915 is 51912315.

It is not a de Polignac number, because 51321915 - 2⁵ = 51321883 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 570199 + ... + 570288.

It is an arithmetic number, because the mean of its divisors is an integer number (7413172).

Almost surely, 2^51321915 is an apocalyptic number.

51321915 is a deficient number, since it is larger than the sum of its proper divisors (37636149).

51321915 is a wasteful number, since it uses less digits than its factorization.

51321915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1140498 (or 1140495 counting only the distinct ones).

The product of its digits is 1350, while the sum is 27.

The square root of 51321915 is about 7163.9315323361. The cubic root of 51321915 is about 371.6216018701.

The spelling of 51321915 in words is "fifty-one million, three hundred twenty-one thousand, nine hundred fifteen".