23628581 has 2 divisors, whose sum is σ = 23628582. Its totient is φ = 23628580.

The previous prime is 23628559. The next prime is 23628593. The reversal of 23628581 is 18582632.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18748900 + 4879681 = 4330^2 + 2209^2 .

It is a cyclic number.

It is not a de Polignac number, because 23628581 - 2¹⁸ = 23366437 is a prime.

It is a super-2 number, since 2×23628581² = 1116619680147122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23628281) 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, 11814290 + 11814291.

It is an arithmetic number, because the mean of its divisors is an integer number (11814291).

Almost surely, 2^23628581 is an apocalyptic number.

It is an amenable number.

23628581 is a deficient number, since it is larger than the sum of its proper divisors (1).

23628581 is an equidigital number, since it uses as much as digits as its factorization.

23628581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23040, while the sum is 35.

The square root of 23628581 is about 4860.9238833785. The cubic root of 23628581 is about 286.9541744751.

The spelling of 23628581 in words is "twenty-three million, six hundred twenty-eight thousand, five hundred eighty-one".