23639569 has 2 divisors, whose sum is σ = 23639570. Its totient is φ = 23639568.

The previous prime is 23639549. The next prime is 23639587. The reversal of 23639569 is 96593632.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20793600 + 2845969 = 4560^2 + 1687^2 .

It is a cyclic number.

It is not a de Polignac number, because 23639569 - 2¹⁷ = 23508497 is a prime.

It is a super-2 number, since 2×23639569² = 1117658445011522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (23639519) 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 as a sum of consecutive naturals, namely, 11819784 + 11819785.

It is an arithmetic number, because the mean of its divisors is an integer number (11819785).

Almost surely, 2^23639569 is an apocalyptic number.

It is an amenable number.

23639569 is a deficient number, since it is larger than the sum of its proper divisors (1).

23639569 is an equidigital number, since it uses as much as digits as its factorization.

23639569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 262440, while the sum is 43.

The square root of 23639569 is about 4862.0539898278. The cubic root of 23639569 is about 286.9986483524.

The spelling of 23639569 in words is "twenty-three million, six hundred thirty-nine thousand, five hundred sixty-nine".