23551609 has 9 divisors (see below), whose sum is σ = 24737349. Its totient is φ = 22420860.

The previous prime is 23551607. The next prime is 23551651. The reversal of 23551609 is 90615532.

The square root of 23551609 is 4853.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 23551609 - 2¹ = 23551607 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23551601) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 111514 + ... + 111724.

Almost surely, 2^23551609 is an apocalyptic number.

23551609 is the 4853-rd square number.

23551609 is the 2427-th centered octagonal number.

It is an amenable number.

23551609 is a deficient number, since it is larger than the sum of its proper divisors (1185740).

23551609 is an frugal number, since it uses more digits than its factorization.

23551609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468 (or 234 counting only the distinct ones).

The product of its (nonzero) digits is 8100, while the sum is 31.

The cubic root of 23551609 is about 286.6422434273.

Multiplying 23551609 by its product of nonzero digits (8100), we get a square (190768032900 = 436770²).

The spelling of 23551609 in words is "twenty-three million, five hundred fifty-one thousand, six hundred nine".