51515516 has 48 divisors (see below), whose sum is σ = 101121888. Its totient is φ = 22809600.

The previous prime is 51515509. The next prime is 51515533. The reversal of 51515516 is 61551515.

It is a happy number.

It is a congruent number.

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, 155471 + ... + 155801.

It is an arithmetic number, because the mean of its divisors is an integer number (2106706).

Almost surely, 2^51515516 is an apocalyptic number.

It is an amenable number.

51515516 is a deficient number, since it is larger than the sum of its proper divisors (49606372).

51515516 is a wasteful number, since it uses less digits than its factorization.

51515516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462 (or 460 counting only the distinct ones).

The product of its digits is 3750, while the sum is 29.

The square root of 51515516 is about 7177.4310167357. The cubic root of 51515516 is about 372.0883033138.

The spelling of 51515516 in words is "fifty-one million, five hundred fifteen thousand, five hundred sixteen".