23331399991 has 2 divisors, whose sum is σ = 23331399992. Its totient is φ = 23331399990.

The previous prime is 23331399967. The next prime is 23331400003. The reversal of 23331399991 is 19999313332.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 23331399991 - 2⁷ = 23331399863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23331399901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11665699995 + 11665699996.

It is an arithmetic number, because the mean of its divisors is an integer number (11665699996).

Almost surely, 2^23331399991 is an apocalyptic number.

23331399991 is a deficient number, since it is larger than the sum of its proper divisors (1).

23331399991 is an equidigital number, since it uses as much as digits as its factorization.

23331399991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1062882, while the sum is 52.

The spelling of 23331399991 in words is "twenty-three billion, three hundred thirty-one million, three hundred ninety-nine thousand, nine hundred ninety-one".