23085809 has 4 divisors (see below), whose sum is σ = 23214960. Its totient is φ = 22956660.

The previous prime is 23085781. The next prime is 23085823. The reversal of 23085809 is 90858032.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 23085809 - 2¹⁶ = 23020273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23082809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64307 + ... + 64664.

It is an arithmetic number, because the mean of its divisors is an integer number (5803740).

Almost surely, 2^23085809 is an apocalyptic number.

It is an amenable number.

23085809 is a deficient number, since it is larger than the sum of its proper divisors (129151).

23085809 is a wasteful number, since it uses less digits than its factorization.

23085809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129150.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 23085809 is about 4804.7694013345. The cubic root of 23085809 is about 284.7399248432.

The spelling of 23085809 in words is "twenty-three million, eighty-five thousand, eight hundred nine".