23431009 has 16 divisors (see below), whose sum is σ = 29102080. Its totient is φ = 18409680.

The previous prime is 23430991. The next prime is 23431013. The reversal of 23431009 is 90013432.

It is a cyclic number.

It is not a de Polignac number, because 23431009 - 2⁵ = 23430977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (23431409) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1282 + ... + 6964.

It is an arithmetic number, because the mean of its divisors is an integer number (1818880).

Almost surely, 2^23431009 is an apocalyptic number.

It is an amenable number.

23431009 is a deficient number, since it is larger than the sum of its proper divisors (5671071).

23431009 is a wasteful number, since it uses less digits than its factorization.

23431009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5740.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 23431009 is about 4840.5587487397. The cubic root of 23431009 is about 286.1521392119.

The spelling of 23431009 in words is "twenty-three million, four hundred thirty-one thousand, nine".