56440531 has 4 divisors (see below), whose sum is σ = 64503472. Its totient is φ = 48377592.

The previous prime is 56440529. The next prime is 56440537. The reversal of 56440531 is 13504465.

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 56440531 - 2¹ = 56440529 is a prime.

It is a super-2 number, since 2×56440531² = 6371067079123922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 56440531.

It is not an unprimeable number, because it can be changed into a prime (56440537) 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, 4031460 + ... + 4031473.

It is an arithmetic number, because the mean of its divisors is an integer number (16125868).

Almost surely, 2^56440531 is an apocalyptic number.

56440531 is a deficient number, since it is larger than the sum of its proper divisors (8062941).

56440531 is an equidigital number, since it uses as much as digits as its factorization.

56440531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8062940.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 56440531 is about 7512.6913286784. The cubic root of 56440531 is about 383.5868381551.

Adding to 56440531 its reverse (13504465), we get a palindrome (69944996).

The spelling of 56440531 in words is "fifty-six million, four hundred forty thousand, five hundred thirty-one".