23391191 has 2 divisors, whose sum is σ = 23391192. Its totient is φ = 23391190.

The previous prime is 23391131. The next prime is 23391211. The reversal of 23391191 is 19119332.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 23391191 - 2⁶ = 23391127 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23391131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11695595 + 11695596.

It is an arithmetic number, because the mean of its divisors is an integer number (11695596).

Almost surely, 2^23391191 is an apocalyptic number.

23391191 is a deficient number, since it is larger than the sum of its proper divisors (1).

23391191 is an equidigital number, since it uses as much as digits as its factorization.

23391191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1458, while the sum is 29.

The square root of 23391191 is about 4836.4440449570. Note that the first 3 decimals coincide. The cubic root of 23391191 is about 285.9899543312.

The spelling of 23391191 in words is "twenty-three million, three hundred ninety-one thousand, one hundred ninety-one".