51521065 has 16 divisors (see below), whose sum is σ = 65761920. Its totient is φ = 38638080.

The previous prime is 51521021. The next prime is 51521077. The reversal of 51521065 is 56012515.

It is not a de Polignac number, because 51521065 - 2²³ = 43132457 is a prime.

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, 6420 + ... + 12010.

It is an arithmetic number, because the mean of its divisors is an integer number (4110120).

Almost surely, 2^51521065 is an apocalyptic number.

It is an amenable number.

51521065 is a deficient number, since it is larger than the sum of its proper divisors (14240855).

51521065 is a wasteful number, since it uses less digits than its factorization.

51521065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5712.

The product of its (nonzero) digits is 1500, while the sum is 25.

The square root of 51521065 is about 7177.8175652492. The cubic root of 51521065 is about 372.1016626796.

The spelling of 51521065 in words is "fifty-one million, five hundred twenty-one thousand, sixty-five".