23564609 has 4 divisors (see below), whose sum is σ = 23604420. Its totient is φ = 23524800.

The previous prime is 23564603. The next prime is 23564641. The reversal of 23564609 is 90646532.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21418384 + 2146225 = 4628^2 + 1465^2 .

It is a cyclic number.

It is not a de Polignac number, because 23564609 - 2²⁴ = 6787393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23564603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19004 + ... + 20205.

It is an arithmetic number, because the mean of its divisors is an integer number (5901105).

Almost surely, 2^23564609 is an apocalyptic number.

It is an amenable number.

23564609 is a deficient number, since it is larger than the sum of its proper divisors (39811).

23564609 is an equidigital number, since it uses as much as digits as its factorization.

23564609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39810.

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 23564609 is about 4854.3391929283. The cubic root of 23564609 is about 286.6949739188.

The spelling of 23564609 in words is "twenty-three million, five hundred sixty-four thousand, six hundred nine".