51231315 has 24 divisors (see below), whose sum is σ = 86520528. Its totient is φ = 25882560.

The previous prime is 51231289. The next prime is 51231329. The reversal of 51231315 is 51313215.

It is not a de Polignac number, because 51231315 - 2⁵ = 51231283 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51231291 and 51231300.

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, 685 + ... + 10145.

It is an arithmetic number, because the mean of its divisors is an integer number (3605022).

Almost surely, 2^51231315 is an apocalyptic number.

51231315 is a deficient number, since it is larger than the sum of its proper divisors (35289213).

51231315 is a wasteful number, since it uses less digits than its factorization.

51231315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9507 (or 9488 counting only the distinct ones).

The product of its digits is 450, while the sum is 21.

The square root of 51231315 is about 7157.6053956613. The cubic root of 51231315 is about 371.4027950906.

The spelling of 51231315 in words is "fifty-one million, two hundred thirty-one thousand, three hundred fifteen".