56431091 has 2 divisors, whose sum is σ = 56431092. Its totient is φ = 56431090.

The previous prime is 56431087. The next prime is 56431097. The reversal of 56431091 is 19013465.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 56431091 - 2² = 56431087 is a prime.

It is a Chen prime.

It is equal to p_3362483 and since 56431091 and 3362483 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (56431097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28215545 + 28215546.

It is an arithmetic number, because the mean of its divisors is an integer number (28215546).

Almost surely, 2^56431091 is an apocalyptic number.

56431091 is a deficient number, since it is larger than the sum of its proper divisors (1).

56431091 is an equidigital number, since it uses as much as digits as its factorization.

56431091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 56431091 is about 7512.0630322169. The cubic root of 56431091 is about 383.5654512689.

The spelling of 56431091 in words is "fifty-six million, four hundred thirty-one thousand, ninety-one".