23666891 has 2 divisors, whose sum is σ = 23666892. Its totient is φ = 23666890.

The previous prime is 23666849. The next prime is 23666893. The reversal of 23666891 is 19866632.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 23666891 - 2¹⁴ = 23650507 is a prime.

Together with 23666893, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (23666893) 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, 11833445 + 11833446.

It is an arithmetic number, because the mean of its divisors is an integer number (11833446).

Almost surely, 2^23666891 is an apocalyptic number.

23666891 is a deficient number, since it is larger than the sum of its proper divisors (1).

23666891 is an equidigital number, since it uses as much as digits as its factorization.

23666891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 41.

The square root of 23666891 is about 4864.8628963209. The cubic root of 23666891 is about 287.1091743108.

The spelling of 23666891 in words is "twenty-three million, six hundred sixty-six thousand, eight hundred ninety-one".