23609 has 2 divisors, whose sum is σ = 23610. Its totient is φ = 23608.

The previous prime is 23603. The next prime is 23623. The reversal of 23609 is 90632.

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., 16384 + 7225 = 128^2 + 85^2 .

It is a cyclic number.

It is not a de Polignac number, because 23609 - 2⁴ = 23593 is a prime.

It is a Chen prime.

It is a plaindrome in base 7.

It is a nialpdrome in base 13 and base 14.

It is not a weakly prime, because it can be changed into another prime (23603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11804 + 11805.

It is an arithmetic number, because the mean of its divisors is an integer number (11805).

2²³⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

23609 is a deficient number, since it is larger than the sum of its proper divisors (1).

23609 is an equidigital number, since it uses as much as digits as its factorization.

23609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 23609 is about 153.6522046702. The cubic root of 23609 is about 28.6874886281.

The spelling of 23609 in words is "twenty-three thousand, six hundred nine".