23056391 has 4 divisors (see below), whose sum is σ = 23618784. Its totient is φ = 22494000.

The previous prime is 23056379. The next prime is 23056417. The reversal of 23056391 is 19365032.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23056391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23056351) 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, 281135 + ... + 281216.

It is an arithmetic number, because the mean of its divisors is an integer number (5904696).

Almost surely, 2^23056391 is an apocalyptic number.

23056391 is a deficient number, since it is larger than the sum of its proper divisors (562393).

23056391 is an equidigital number, since it uses as much as digits as its factorization.

23056391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 562392.

The product of its (nonzero) digits is 4860, while the sum is 29.

The square root of 23056391 is about 4801.7070922746. The cubic root of 23056391 is about 284.6189264173.

The spelling of 23056391 in words is "twenty-three million, fifty-six thousand, three hundred ninety-one".