51501513 has 32 divisors (see below), whose sum is σ = 80593920. Its totient is φ = 28647360.

The previous prime is 51501503. The next prime is 51501539. The reversal of 51501513 is 31510515.

51501513 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51501513 - 2⁴ = 51501497 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 51501513.

It is not an unprimeable number, because it can be changed into a prime (51501503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 243978 + ... + 244188.

It is an arithmetic number, because the mean of its divisors is an integer number (2518560).

Almost surely, 2^51501513 is an apocalyptic number.

It is an amenable number.

51501513 is a deficient number, since it is larger than the sum of its proper divisors (29092407).

51501513 is a wasteful number, since it uses less digits than its factorization.

51501513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 477.

The product of its (nonzero) digits is 375, while the sum is 21.

The square root of 51501513 is about 7176.4554621345. The cubic root of 51501513 is about 372.0545864515.

The spelling of 51501513 in words is "fifty-one million, five hundred one thousand, five hundred thirteen".