23118391 has 4 divisors (see below), whose sum is σ = 23656072. Its totient is φ = 22580712.

The previous prime is 23118371. The next prime is 23118397. The reversal of 23118391 is 19381132.

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 23118391 - 2¹¹ = 23116343 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 (23118397) 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 3 ways as a sum of consecutive naturals, for example, 268776 + ... + 268861.

It is an arithmetic number, because the mean of its divisors is an integer number (5914018).

Almost surely, 2^23118391 is an apocalyptic number.

23118391 is a deficient number, since it is larger than the sum of its proper divisors (537681).

23118391 is an equidigital number, since it uses as much as digits as its factorization.

23118391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 537680.

The product of its digits is 1296, while the sum is 28.

The square root of 23118391 is about 4808.1587952147. The cubic root of 23118391 is about 284.8738171277.

The spelling of 23118391 in words is "twenty-three million, one hundred eighteen thousand, three hundred ninety-one".