56431191 has 16 divisors (see below), whose sum is σ = 77875200. Its totient is φ = 36310560.

The previous prime is 56431189. The next prime is 56431223. The reversal of 56431191 is 19113465.

It is not a de Polignac number, because 56431191 - 2¹ = 56431189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56431171) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55201 + ... + 56213.

It is an arithmetic number, because the mean of its divisors is an integer number (4867200).

Almost surely, 2^56431191 is an apocalyptic number.

56431191 is a deficient number, since it is larger than the sum of its proper divisors (21444009).

56431191 is a wasteful number, since it uses less digits than its factorization.

56431191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1646.

The product of its digits is 3240, while the sum is 30.

The square root of 56431191 is about 7512.0696881752. The cubic root of 56431191 is about 383.5656778374.

It can be divided in two parts, 5643119 and 1, that added together give a triangular number (5643120 = T₃₃₅₉).

The spelling of 56431191 in words is "fifty-six million, four hundred thirty-one thousand, one hundred ninety-one".