56916121 has 4 divisors (see below), whose sum is σ = 56945700. Its totient is φ = 56886544.

The previous prime is 56916109. The next prime is 56916131. The reversal of 56916121 is 12161965.

56916121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5593225 + 51322896 = 2365^2 + 7164^2 .

It is a cyclic number.

It is not a de Polignac number, because 56916121 - 2⁵ = 56916089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56916131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11686 + ... + 15823.

It is an arithmetic number, because the mean of its divisors is an integer number (14236425).

Almost surely, 2^56916121 is an apocalyptic number.

It is an amenable number.

56916121 is a deficient number, since it is larger than the sum of its proper divisors (29579).

56916121 is a wasteful number, since it uses less digits than its factorization.

56916121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29578.

The product of its digits is 3240, while the sum is 31.

The square root of 56916121 is about 7544.2773676476. The cubic root of 56916121 is about 384.6612435955.

The spelling of 56916121 in words is "fifty-six million, nine hundred sixteen thousand, one hundred twenty-one".