23445509 has 2 divisors, whose sum is σ = 23445510. Its totient is φ = 23445508.

The previous prime is 23445497. The next prime is 23445553. The reversal of 23445509 is 90554432.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22829284 + 616225 = 4778^2 + 785^2 .

It is a cyclic number.

It is not a de Polignac number, because 23445509 - 2⁴ = 23445493 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23445559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11722754 + 11722755.

It is an arithmetic number, because the mean of its divisors is an integer number (11722755).

Almost surely, 2^23445509 is an apocalyptic number.

It is an amenable number.

23445509 is a deficient number, since it is larger than the sum of its proper divisors (1).

23445509 is an equidigital number, since it uses as much as digits as its factorization.

23445509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 23445509 is about 4842.0562780703. The cubic root of 23445509 is about 286.2111543175.

The spelling of 23445509 in words is "twenty-three million, four hundred forty-five thousand, five hundred nine".