23664581 has 2 divisors, whose sum is σ = 23664582. Its totient is φ = 23664580.

The previous prime is 23664521. The next prime is 23664587. The reversal of 23664581 is 18546632.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23367556 + 297025 = 4834^2 + 545^2 .

It is a cyclic number.

It is not a de Polignac number, because 23664581 - 2⁶ = 23664517 is a prime.

It is a super-2 number, since 2×23664581² = 1120024787811122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23664587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11832290 + 11832291.

It is an arithmetic number, because the mean of its divisors is an integer number (11832291).

Almost surely, 2^23664581 is an apocalyptic number.

It is an amenable number.

23664581 is a deficient number, since it is larger than the sum of its proper divisors (1).

23664581 is an equidigital number, since it uses as much as digits as its factorization.

23664581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 35.

The square root of 23664581 is about 4864.6254737647. The cubic root of 23664581 is about 287.0998329378.

The spelling of 23664581 in words is "twenty-three million, six hundred sixty-four thousand, five hundred eighty-one".