56431831 has 4 divisors (see below), whose sum is σ = 56990664. Its totient is φ = 55873000.

The previous prime is 56431801. The next prime is 56431853. The reversal of 56431831 is 13813465.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 56431831 - 2¹⁷ = 56300759 is a prime.

It is a super-2 number, since 2×56431831² = 6369103100025122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 56431793 and 56431802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56431801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 279265 + ... + 279466.

It is an arithmetic number, because the mean of its divisors is an integer number (14247666).

Almost surely, 2^56431831 is an apocalyptic number.

56431831 is a deficient number, since it is larger than the sum of its proper divisors (558833).

56431831 is a wasteful number, since it uses less digits than its factorization.

56431831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 558832.

The product of its digits is 8640, while the sum is 31.

The square root of 56431831 is about 7512.1122861683. The cubic root of 56431831 is about 383.5671278694.

The spelling of 56431831 in words is "fifty-six million, four hundred thirty-one thousand, eight hundred thirty-one".