23091813 has 6 divisors (see below), whose sum is σ = 33354854. Its totient is φ = 15394536.

The previous prime is 23091791. The next prime is 23091857. The reversal of 23091813 is 31819032.

It can be written as a sum of positive squares in only one way, i.e., 17489124 + 5602689 = 4182^2 + 2367^2 .

It is not a de Polignac number, because 23091813 - 2⁵ = 23091781 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 (23091883) 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 5 ways as a sum of consecutive naturals, for example, 1282870 + ... + 1282887.

Almost surely, 2^23091813 is an apocalyptic number.

It is an amenable number.

23091813 is a deficient number, since it is larger than the sum of its proper divisors (10263041).

23091813 is a wasteful number, since it uses less digits than its factorization.

23091813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2565763 (or 2565760 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 23091813 is about 4805.3941565703. The cubic root of 23091813 is about 284.7646071105.

The spelling of 23091813 in words is "twenty-three million, ninety-one thousand, eight hundred thirteen".