51521715 has 24 divisors (see below), whose sum is σ = 102062688. Its totient is φ = 23552640.

The previous prime is 51521689. The next prime is 51521737. The reversal of 51521715 is 51712515.

It is not a de Polignac number, because 51521715 - 2¹² = 51517619 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 81466 + ... + 82095.

It is an arithmetic number, because the mean of its divisors is an integer number (4252612).

Almost surely, 2^51521715 is an apocalyptic number.

51521715 is a deficient number, since it is larger than the sum of its proper divisors (50540973).

51521715 is a wasteful number, since it uses less digits than its factorization.

51521715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163579 (or 163576 counting only the distinct ones).

The product of its digits is 1750, while the sum is 27.

The square root of 51521715 is about 7177.8628434932. The cubic root of 51521715 is about 372.1032275092.

The spelling of 51521715 in words is "fifty-one million, five hundred twenty-one thousand, seven hundred fifteen".