51520325 has 12 divisors (see below), whose sum is σ = 64037568. Its totient is φ = 41118000.

The previous prime is 51520307. The next prime is 51520333. The reversal of 51520325 is 52302515.

It is a de Polignac number, because none of the positive numbers 2^k-51520325 is a prime.

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 51520325.

It is a congruent number.

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, 9350 + ... + 13800.

It is an arithmetic number, because the mean of its divisors is an integer number (5336464).

Almost surely, 2^51520325 is an apocalyptic number.

It is an amenable number.

51520325 is a deficient number, since it is larger than the sum of its proper divisors (12517243).

51520325 is a wasteful number, since it uses less digits than its factorization.

51520325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4924 (or 4919 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 23.

The square root of 51520325 is about 7177.7660173622. The cubic root of 51520325 is about 372.0998811652.

The spelling of 51520325 in words is "fifty-one million, five hundred twenty thousand, three hundred twenty-five".