23456509 has 2 divisors, whose sum is σ = 23456510. Its totient is φ = 23456508.

The previous prime is 23456501. The next prime is 23456539. The reversal of 23456509 is 90565432.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20052484 + 3404025 = 4478^2 + 1845^2 .

It is a cyclic number.

It is not a de Polignac number, because 23456509 - 2³ = 23456501 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23456501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11728254 + 11728255.

It is an arithmetic number, because the mean of its divisors is an integer number (11728255).

Almost surely, 2^23456509 is an apocalyptic number.

It is an amenable number.

23456509 is a deficient number, since it is larger than the sum of its proper divisors (1).

23456509 is an equidigital number, since it uses as much as digits as its factorization.

23456509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32400, while the sum is 34.

The square root of 23456509 is about 4843.1920259267. The cubic root of 23456509 is about 286.2559081686.

The spelling of 23456509 in words is "twenty-three million, four hundred fifty-six thousand, five hundred nine".