56431121 has 16 divisors (see below), whose sum is σ = 62346240. Its totient is φ = 50838480.

The previous prime is 56431097. The next prime is 56431139. The reversal of 56431121 is 12113465.

It is a cyclic number.

It is not a de Polignac number, because 56431121 - 2⁶ = 56431057 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

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

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 114686 + ... + 115176.

It is an arithmetic number, because the mean of its divisors is an integer number (3896640).

Almost surely, 2^56431121 is an apocalyptic number.

It is an amenable number.

56431121 is a deficient number, since it is larger than the sum of its proper divisors (5915119).

56431121 is a wasteful number, since it uses less digits than its factorization.

56431121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 796.

The product of its digits is 720, while the sum is 23.

The square root of 56431121 is about 7512.0650290050. The cubic root of 56431121 is about 383.5655192394.

Adding to 56431121 its reverse (12113465), we get a palindrome (68544586).

The spelling of 56431121 in words is "fifty-six million, four hundred thirty-one thousand, one hundred twenty-one".