56215897 has 2 divisors, whose sum is σ = 56215898. Its totient is φ = 56215896.

The previous prime is 56215877. The next prime is 56215903. The reversal of 56215897 is 79851265.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39740416 + 16475481 = 6304^2 + 4059^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56215897 is a prime.

It is not a weakly prime, because it can be changed into another prime (56215837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28107948 + 28107949.

It is an arithmetic number, because the mean of its divisors is an integer number (28107949).

Almost surely, 2^56215897 is an apocalyptic number.

It is an amenable number.

56215897 is a deficient number, since it is larger than the sum of its proper divisors (1).

56215897 is an equidigital number, since it uses as much as digits as its factorization.

56215897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 151200, while the sum is 43.

The square root of 56215897 is about 7497.7261219652. The cubic root of 56215897 is about 383.0772680969.

The spelling of 56215897 in words is "fifty-six million, two hundred fifteen thousand, eight hundred ninety-seven".