23642557 has 2 divisors, whose sum is σ = 23642558. Its totient is φ = 23642556.

The previous prime is 23642537. The next prime is 23642573. The reversal of 23642557 is 75524632.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14945956 + 8696601 = 3866^2 + 2949^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23642557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23642537) 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, 11821278 + 11821279.

It is an arithmetic number, because the mean of its divisors is an integer number (11821279).

Almost surely, 2^23642557 is an apocalyptic number.

It is an amenable number.

23642557 is a deficient number, since it is larger than the sum of its proper divisors (1).

23642557 is an equidigital number, since it uses as much as digits as its factorization.

23642557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50400, while the sum is 34.

The square root of 23642557 is about 4862.3612576607. The cubic root of 23642557 is about 287.0107398847.

The spelling of 23642557 in words is "twenty-three million, six hundred forty-two thousand, five hundred fifty-seven".