23091865 has 16 divisors (see below), whose sum is σ = 29467152. Its totient is φ = 17311744.

The previous prime is 23091857. The next prime is 23091877. The reversal of 23091865 is 56819032.

It can be written as a sum of positive squares in 8 ways, for example, as 80656 + 23011209 = 284^2 + 4797^2 .

It is a cyclic number.

It is not a de Polignac number, because 23091865 - 2³ = 23091857 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23091865.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 26517 + ... + 27373.

It is an arithmetic number, because the mean of its divisors is an integer number (1841697).

Almost surely, 2^23091865 is an apocalyptic number.

It is an amenable number.

23091865 is a deficient number, since it is larger than the sum of its proper divisors (6375287).

23091865 is a wasteful number, since it uses less digits than its factorization.

23091865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1196.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 23091865 is about 4805.3995671536. The cubic root of 23091865 is about 284.7648208623.

The spelling of 23091865 in words is "twenty-three million, ninety-one thousand, eight hundred sixty-five".