56388091 has 4 divisors (see below), whose sum is σ = 56407312. Its totient is φ = 56368872.

The previous prime is 56388077. The next prime is 56388107. The reversal of 56388091 is 19088365.

It is a happy number.

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 56388091 - 2⁹ = 56387579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56388001) 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, 4191 + ... + 11416.

It is an arithmetic number, because the mean of its divisors is an integer number (14101828).

Almost surely, 2^56388091 is an apocalyptic number.

56388091 is a deficient number, since it is larger than the sum of its proper divisors (19221).

56388091 is a wasteful number, since it uses less digits than its factorization.

56388091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19220.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 56388091 is about 7509.2004234805. The cubic root of 56388091 is about 383.4680020014.

The spelling of 56388091 in words is "fifty-six million, three hundred eighty-eight thousand, ninety-one".