23056509 has 24 divisors (see below), whose sum is σ = 36310368. Its totient is φ = 12972960.

The previous prime is 23056507. The next prime is 23056531. The reversal of 23056509 is 90565032.

It is not a de Polignac number, because 23056509 - 2¹ = 23056507 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23056507) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8679 + ... + 11019.

It is an arithmetic number, because the mean of its divisors is an integer number (1512932).

Almost surely, 2^23056509 is an apocalyptic number.

It is an amenable number.

23056509 is a deficient number, since it is larger than the sum of its proper divisors (13253859).

23056509 is a wasteful number, since it uses less digits than its factorization.

23056509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2425 (or 2418 counting only the distinct ones).

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

The square root of 23056509 is about 4801.7193795556. The cubic root of 23056509 is about 284.6194119656.

The spelling of 23056509 in words is "twenty-three million, fifty-six thousand, five hundred nine".