23649991 has 2 divisors, whose sum is σ = 23649992. Its totient is φ = 23649990.

The previous prime is 23649959. The next prime is 23650001. The reversal of 23649991 is 19994632.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 23649991 - 2⁵ = 23649959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23649391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11824995 + 11824996.

It is an arithmetic number, because the mean of its divisors is an integer number (11824996).

Almost surely, 2^23649991 is an apocalyptic number.

23649991 is a deficient number, since it is larger than the sum of its proper divisors (1).

23649991 is an equidigital number, since it uses as much as digits as its factorization.

23649991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 104976, while the sum is 43.

The square root of 23649991 is about 4863.1256409844. The cubic root of 23649991 is about 287.0408186145.

The spelling of 23649991 in words is "twenty-three million, six hundred forty-nine thousand, nine hundred ninety-one".