23651609 has 2 divisors, whose sum is σ = 23651610. Its totient is φ = 23651608.

The previous prime is 23651569. The next prime is 23651633. The reversal of 23651609 is 90615632.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22657600 + 994009 = 4760^2 + 997^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23651609 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (23651009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11825804 + 11825805.

It is an arithmetic number, because the mean of its divisors is an integer number (11825805).

Almost surely, 2^23651609 is an apocalyptic number.

It is an amenable number.

23651609 is a deficient number, since it is larger than the sum of its proper divisors (1).

23651609 is an equidigital number, since it uses as much as digits as its factorization.

23651609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 23651609 is about 4863.2919920564. The cubic root of 23651609 is about 287.0473643739.

The spelling of 23651609 in words is "twenty-three million, six hundred fifty-one thousand, six hundred nine".