23565009 has 16 divisors (see below), whose sum is σ = 35828352. Its totient is φ = 13648128.

The previous prime is 23564987. The next prime is 23565049. The reversal of 23565009 is 90056532.

It is not a de Polignac number, because 23565009 - 2⁷ = 23564881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (23565049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17109 + ... + 18434.

It is an arithmetic number, because the mean of its divisors is an integer number (2239272).

Almost surely, 2^23565009 is an apocalyptic number.

It is an amenable number.

23565009 is a deficient number, since it is larger than the sum of its proper divisors (12263343).

23565009 is a wasteful number, since it uses less digits than its factorization.

23565009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35576.

The product of its (nonzero) digits is 8100, while the sum is 30.

The square root of 23565009 is about 4854.3803930059. The cubic root of 23565009 is about 286.6965960879.

The spelling of 23565009 in words is "twenty-three million, five hundred sixty-five thousand, nine".