51507065 has 16 divisors (see below), whose sum is σ = 63590400. Its totient is φ = 40031040.

The previous prime is 51507047. The next prime is 51507067. The reversal of 51507065 is 56070515.

It is not a de Polignac number, because 51507065 - 2⁸ = 51506809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51507067) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34280 + ... + 35750.

It is an arithmetic number, because the mean of its divisors is an integer number (3974400).

Almost surely, 2^51507065 is an apocalyptic number.

It is an amenable number.

51507065 is a deficient number, since it is larger than the sum of its proper divisors (12083335).

51507065 is a wasteful number, since it uses less digits than its factorization.

51507065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1672.

The product of its (nonzero) digits is 5250, while the sum is 29.

The square root of 51507065 is about 7176.8422721974. The cubic root of 51507065 is about 372.0679554622.

The spelling of 51507065 in words is "fifty-one million, five hundred seven thousand, sixty-five".