56515311 has 6 divisors (see below), whose sum is σ = 81633240. Its totient is φ = 37676868.

The previous prime is 56515307. The next prime is 56515313. The reversal of 56515311 is 11351565.

56515311 is a `hidden beast` number, since 5 + 651 + 5 + 3 + 1 + 1 = 666.

It is not a de Polignac number, because 56515311 - 2² = 56515307 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56515313) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3139731 + ... + 3139748.

It is an arithmetic number, because the mean of its divisors is an integer number (13605540).

Almost surely, 2^56515311 is an apocalyptic number.

56515311 is a deficient number, since it is larger than the sum of its proper divisors (25117929).

56515311 is a wasteful number, since it uses less digits than its factorization.

56515311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6279485 (or 6279482 counting only the distinct ones).

The product of its digits is 2250, while the sum is 27.

The square root of 56515311 is about 7517.6665927667. Note that the first 3 decimals coincide. The cubic root of 56515311 is about 383.7561725215.

Adding to 56515311 its reverse (11351565), we get a palindrome (67866876).

It can be divided in two parts, 565 and 15311, that added together give a square (15876 = 126²).

The spelling of 56515311 in words is "fifty-six million, five hundred fifteen thousand, three hundred eleven".