56415391 has 2 divisors, whose sum is σ = 56415392. Its totient is φ = 56415390.

The previous prime is 56415377. The next prime is 56415397. The reversal of 56415391 is 19351465.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56415391 - 2¹³ = 56407199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56415397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28207695 + 28207696.

It is an arithmetic number, because the mean of its divisors is an integer number (28207696).

Almost surely, 2^56415391 is an apocalyptic number.

56415391 is a deficient number, since it is larger than the sum of its proper divisors (1).

56415391 is an equidigital number, since it uses as much as digits as its factorization.

56415391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16200, while the sum is 34.

The square root of 56415391 is about 7511.0179736172. The cubic root of 56415391 is about 383.5298766944.

The spelling of 56415391 in words is "fifty-six million, four hundred fifteen thousand, three hundred ninety-one".