56216431 has 4 divisors (see below), whose sum is σ = 57735832. Its totient is φ = 54697032.

The previous prime is 56216401. The next prime is 56216449. The reversal of 56216431 is 13461265.

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 56216431 - 2²⁵ = 22661999 is a prime.

It is a super-2 number, since 2×56216431² = 6320574228755522, 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 56216431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56216401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 759645 + ... + 759718.

It is an arithmetic number, because the mean of its divisors is an integer number (14433958).

Almost surely, 2^56216431 is an apocalyptic number.

56216431 is a deficient number, since it is larger than the sum of its proper divisors (1519401).

56216431 is a wasteful number, since it uses less digits than its factorization.

56216431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1519400.

The product of its digits is 4320, while the sum is 28.

The square root of 56216431 is about 7497.7617326773. The cubic root of 56216431 is about 383.0784810552.

Adding to 56216431 its reverse (13461265), we get a palindrome (69677696).

The spelling of 56216431 in words is "fifty-six million, two hundred sixteen thousand, four hundred thirty-one".