99111019391 has 2 divisors, whose sum is σ = 99111019392. Its totient is φ = 99111019390.

The previous prime is 99111019339. The next prime is 99111019393. The reversal of 99111019391 is 19391011199.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99111019391 - 2⁶ = 99111019327 is a prime.

It is a Sophie Germain prime.

Together with 99111019393, 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 (99111019393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49555509695 + 49555509696.

It is an arithmetic number, because the mean of its divisors is an integer number (49555509696).

Almost surely, 2^99111019391 is an apocalyptic number.

99111019391 is a deficient number, since it is larger than the sum of its proper divisors (1).

99111019391 is an equidigital number, since it uses as much as digits as its factorization.

99111019391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19683, while the sum is 44.

The spelling of 99111019391 in words is "ninety-nine billion, one hundred eleven million, nineteen thousand, three hundred ninety-one".