56157091 has 2 divisors, whose sum is σ = 56157092. Its totient is φ = 56157090.

The previous prime is 56157067. The next prime is 56157109. The reversal of 56157091 is 19075165.

Together with next prime (56157109) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56157091 - 2¹⁹ = 55632803 is a prime.

It is not a weakly prime, because it can be changed into another prime (56157061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28078545 + 28078546.

It is an arithmetic number, because the mean of its divisors is an integer number (28078546).

Almost surely, 2^56157091 is an apocalyptic number.

56157091 is a deficient number, since it is larger than the sum of its proper divisors (1).

56157091 is an equidigital number, since it uses as much as digits as its factorization.

56157091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9450, while the sum is 34.

The square root of 56157091 is about 7493.8035068982. The cubic root of 56157091 is about 382.9436457430.

The spelling of 56157091 in words is "fifty-six million, one hundred fifty-seven thousand, ninety-one".