56658191 has 2 divisors, whose sum is σ = 56658192. Its totient is φ = 56658190.

The previous prime is 56658181. The next prime is 56658193. The reversal of 56658191 is 19185665.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56658191 is a prime.

It is a Sophie Germain prime.

Together with 56658193, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56658193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28329095 + 28329096.

It is an arithmetic number, because the mean of its divisors is an integer number (28329096).

Almost surely, 2^56658191 is an apocalyptic number.

56658191 is a deficient number, since it is larger than the sum of its proper divisors (1).

56658191 is an equidigital number, since it uses as much as digits as its factorization.

56658191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64800, while the sum is 41.

The square root of 56658191 is about 7527.1635427962. The cubic root of 56658191 is about 384.0792999384.

The spelling of 56658191 in words is "fifty-six million, six hundred fifty-eight thousand, one hundred ninety-one".