51315756 has 12 divisors (see below), whose sum is σ = 119736792. Its totient is φ = 17105248.

The previous prime is 51315743. The next prime is 51315763. The reversal of 51315756 is 65751315.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2138145 + ... + 2138168.

It is an arithmetic number, because the mean of its divisors is an integer number (9978066).

Almost surely, 2^51315756 is an apocalyptic number.

It is an amenable number.

51315756 is an abundant number, since it is smaller than the sum of its proper divisors (68421036).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51315756 is a wasteful number, since it uses less digits than its factorization.

51315756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4276320 (or 4276318 counting only the distinct ones).

The product of its digits is 15750, while the sum is 33.

The square root of 51315756 is about 7163.5016577090. The cubic root of 51315756 is about 371.6067355177.

The spelling of 51315756 in words is "fifty-one million, three hundred fifteen thousand, seven hundred fifty-six".