51311625 has 32 divisors (see below), whose sum is σ = 85857408. Its totient is φ = 27214400.

The previous prime is 51311591. The next prime is 51311669. The reversal of 51311625 is 52611315.

It is not a de Polignac number, because 51311625 - 2⁷ = 51311497 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 51311595 and 51311604.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 109642 + ... + 110108.

It is an arithmetic number, because the mean of its divisors is an integer number (2683044).

Almost surely, 2^51311625 is an apocalyptic number.

It is an amenable number.

51311625 is a deficient number, since it is larger than the sum of its proper divisors (34545783).

51311625 is a wasteful number, since it uses less digits than its factorization.

51311625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 778 (or 768 counting only the distinct ones).

The product of its digits is 900, while the sum is 24.

The square root of 51311625 is about 7163.2133152657. The cubic root of 51311625 is about 371.5967636057.

The spelling of 51311625 in words is "fifty-one million, three hundred eleven thousand, six hundred twenty-five".