23889991 has 2 divisors, whose sum is σ = 23889992. Its totient is φ = 23889990.

The previous prime is 23889953. The next prime is 23890001. The reversal of 23889991 is 19998832.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23889991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23889191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11944995 + 11944996.

It is an arithmetic number, because the mean of its divisors is an integer number (11944996).

Almost surely, 2^23889991 is an apocalyptic number.

23889991 is a deficient number, since it is larger than the sum of its proper divisors (1).

23889991 is an equidigital number, since it uses as much as digits as its factorization.

23889991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 279936, while the sum is 49.

The square root of 23889991 is about 4887.7388432689. The cubic root of 23889991 is about 288.0085155340.

The spelling of 23889991 in words is "twenty-three million, eight hundred eighty-nine thousand, nine hundred ninety-one".