23329991 has 2 divisors, whose sum is σ = 23329992. Its totient is φ = 23329990.

The previous prime is 23329979. The next prime is 23329993. The reversal of 23329991 is 19992332.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23329991 is a prime.

Together with 23329993, 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 (23329993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11664995 + 11664996.

It is an arithmetic number, because the mean of its divisors is an integer number (11664996).

Almost surely, 2^23329991 is an apocalyptic number.

23329991 is a deficient number, since it is larger than the sum of its proper divisors (1).

23329991 is an equidigital number, since it uses as much as digits as its factorization.

23329991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26244, while the sum is 38.

The square root of 23329991 is about 4830.1129386382. The cubic root of 23329991 is about 285.7403180209.

The spelling of 23329991 in words is "twenty-three million, three hundred twenty-nine thousand, nine hundred ninety-one".