23565209 has 2 divisors, whose sum is σ = 23565210. Its totient is φ = 23565208.

The previous prime is 23565137. The next prime is 23565251. The reversal of 23565209 is 90256532.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20675209 + 2890000 = 4547^2 + 1700^2 .

It is a cyclic number.

It is not a de Polignac number, because 23565209 - 2¹⁶ = 23499673 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (23565299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11782604 + 11782605.

It is an arithmetic number, because the mean of its divisors is an integer number (11782605).

Almost surely, 2^23565209 is an apocalyptic number.

It is an amenable number.

23565209 is a deficient number, since it is larger than the sum of its proper divisors (1).

23565209 is an equidigital number, since it uses as much as digits as its factorization.

23565209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16200, while the sum is 32.

The square root of 23565209 is about 4854.4009929135. The cubic root of 23565209 is about 286.6974071656.

The spelling of 23565209 in words is "twenty-three million, five hundred sixty-five thousand, two hundred nine".