56405331 has 12 divisors (see below), whose sum is σ = 81701152. Its totient is φ = 37498896.

The previous prime is 56405317. The next prime is 56405333. The reversal of 56405331 is 13350465.

It is not a de Polignac number, because 56405331 - 2⁶ = 56405267 is a prime.

It is a super-2 number, since 2×56405331² = 6363122730439122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 56405295 and 56405304.

It is not an unprimeable number, because it can be changed into a prime (56405333) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5236 + ... + 11841.

Almost surely, 2^56405331 is an apocalyptic number.

56405331 is a deficient number, since it is larger than the sum of its proper divisors (25295821).

56405331 is a wasteful number, since it uses less digits than its factorization.

56405331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17450 (or 17447 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 27.

The square root of 56405331 is about 7510.3482608998. The cubic root of 56405331 is about 383.5070783064.

Adding to 56405331 its reverse (13350465), we get a palindrome (69755796).

The spelling of 56405331 in words is "fifty-six million, four hundred five thousand, three hundred thirty-one".