51402625 has 16 divisors (see below), whose sum is σ = 64548432. Its totient is φ = 40867200.

The previous prime is 51402607. The next prime is 51402641. The reversal of 51402625 is 52620415.

It can be written as a sum of positive squares in 8 ways, for example, as 8473921 + 42928704 = 2911^2 + 6552^2 .

It is not a de Polignac number, because 51402625 - 2¹¹ = 51400577 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51402625.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20437 + ... + 22813.

It is an arithmetic number, because the mean of its divisors is an integer number (4034277).

Almost surely, 2^51402625 is an apocalyptic number.

It is an amenable number.

51402625 is a deficient number, since it is larger than the sum of its proper divisors (13145807).

51402625 is a wasteful number, since it uses less digits than its factorization.

51402625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2565 (or 2555 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 51402625 is about 7169.5623994774. The cubic root of 51402625 is about 371.8163066750.

The spelling of 51402625 in words is "fifty-one million, four hundred two thousand, six hundred twenty-five".