23981609 has 4 divisors (see below), whose sum is σ = 24491904. Its totient is φ = 23471316.

The previous prime is 23981563. The next prime is 23981621. The reversal of 23981609 is 90618932.

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 23981609 - 2²⁰ = 22933033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23941609) 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, 255077 + ... + 255170.

It is an arithmetic number, because the mean of its divisors is an integer number (6122976).

Almost surely, 2^23981609 is an apocalyptic number.

It is an amenable number.

23981609 is a deficient number, since it is larger than the sum of its proper divisors (510295).

23981609 is an equidigital number, since it uses as much as digits as its factorization.

23981609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510294.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 23981609 is about 4897.1021022642. The cubic root of 23981609 is about 288.3762163118.

The spelling of 23981609 in words is "twenty-three million, nine hundred eighty-one thousand, six hundred nine".