23643649 has 2 divisors, whose sum is σ = 23643650. Its totient is φ = 23643648.

The previous prime is 23643647. The next prime is 23643667. The reversal of 23643649 is 94634632.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22657600 + 986049 = 4760^2 + 993^2 .

It is a cyclic number.

It is not a de Polignac number, because 23643649 - 2¹ = 23643647 is a prime.

Together with 23643647, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (23643643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11821824 + 11821825.

It is an arithmetic number, because the mean of its divisors is an integer number (11821825).

Almost surely, 2^23643649 is an apocalyptic number.

It is an amenable number.

23643649 is a deficient number, since it is larger than the sum of its proper divisors (1).

23643649 is an equidigital number, since it uses as much as digits as its factorization.

23643649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 37.

The square root of 23643649 is about 4862.4735474859. The cubic root of 23643649 is about 287.0151586242.

The spelling of 23643649 in words is "twenty-three million, six hundred forty-three thousand, six hundred forty-nine".