23086991 has 2 divisors, whose sum is σ = 23086992. Its totient is φ = 23086990.

The previous prime is 23086979. The next prime is 23086993. The reversal of 23086991 is 19968032.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 23086991 - 2¹⁰ = 23085967 is a prime.

It is a Sophie Germain prime.

Together with 23086993, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23086993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11543495 + 11543496.

It is an arithmetic number, because the mean of its divisors is an integer number (11543496).

Almost surely, 2^23086991 is an apocalyptic number.

23086991 is a deficient number, since it is larger than the sum of its proper divisors (1).

23086991 is an equidigital number, since it uses as much as digits as its factorization.

23086991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 23086991 is about 4804.8924025414. The cubic root of 23086991 is about 284.7447843487.

The spelling of 23086991 in words is "twenty-three million, eighty-six thousand, nine hundred ninety-one".