56831191 has 2 divisors, whose sum is σ = 56831192. Its totient is φ = 56831190.

The previous prime is 56831171. The next prime is 56831197. The reversal of 56831191 is 19113865.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56831191 - 2¹³ = 56822999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56831197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28415595 + 28415596.

It is an arithmetic number, because the mean of its divisors is an integer number (28415596).

Almost surely, 2^56831191 is an apocalyptic number.

56831191 is a deficient number, since it is larger than the sum of its proper divisors (1).

56831191 is an equidigital number, since it uses as much as digits as its factorization.

56831191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 34.

The square root of 56831191 is about 7538.6464965536. The cubic root of 56831191 is about 384.4698183778.

The spelling of 56831191 in words is "fifty-six million, eight hundred thirty-one thousand, one hundred ninety-one".