51606515 has 16 divisors (see below), whose sum is σ = 64514880. Its totient is φ = 39580800.

The previous prime is 51606491. The next prime is 51606521. The reversal of 51606515 is 51560615.

It is not a de Polignac number, because 51606515 - 2²⁰ = 50557939 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

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, 20717 + ... + 23073.

It is an arithmetic number, because the mean of its divisors is an integer number (4032180).

Almost surely, 2^51606515 is an apocalyptic number.

51606515 is a deficient number, since it is larger than the sum of its proper divisors (12908365).

51606515 is a wasteful number, since it uses less digits than its factorization.

51606515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2542.

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 51606515 is about 7183.7674656130. The cubic root of 51606515 is about 372.3072648272.

The spelling of 51606515 in words is "fifty-one million, six hundred six thousand, five hundred fifteen".