56516551 has 36 divisors (see below), whose sum is σ = 75455688. Its totient is φ = 41948928.

The previous prime is 56516549. The next prime is 56516591. The reversal of 56516551 is 15561565.

It is not a de Polignac number, because 56516551 - 2¹ = 56516549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56516531) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 183940 + ... + 184246.

Almost surely, 2^56516551 is an apocalyptic number.

56516551 is a deficient number, since it is larger than the sum of its proper divisors (18939137).

56516551 is a wasteful number, since it uses less digits than its factorization.

56516551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368 (or 344 counting only the distinct ones).

The product of its digits is 22500, while the sum is 34.

The square root of 56516551 is about 7517.7490647135. The cubic root of 56516551 is about 383.7589791601.

The spelling of 56516551 in words is "fifty-six million, five hundred sixteen thousand, five hundred fifty-one".