23457509 has 2 divisors, whose sum is σ = 23457510. Its totient is φ = 23457508.

The previous prime is 23457487. The next prime is 23457521. The reversal of 23457509 is 90575432.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17222500 + 6235009 = 4150^2 + 2497^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23457509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23457209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11728754 + 11728755.

It is an arithmetic number, because the mean of its divisors is an integer number (11728755).

Almost surely, 2^23457509 is an apocalyptic number.

It is an amenable number.

23457509 is a deficient number, since it is larger than the sum of its proper divisors (1).

23457509 is an equidigital number, since it uses as much as digits as its factorization.

23457509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37800, while the sum is 35.

The square root of 23457509 is about 4843.2952625253. The cubic root of 23457509 is about 286.2599760067.

The spelling of 23457509 in words is "twenty-three million, four hundred fifty-seven thousand, five hundred nine".