111110111100991 has 2 divisors, whose sum is σ = 111110111100992. Its totient is φ = 111110111100990.

The previous prime is 111110111100973. The next prime is 111110111101027. The reversal of 111110111100991 is 199001111011111.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 111110111100991 - 2³³ = 111101521166399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111110111100931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55555055550495 + 55555055550496.

It is an arithmetic number, because the mean of its divisors is an integer number (55555055550496).

Almost surely, 2^{111110111100991} is an apocalyptic number.

111110111100991 is a deficient number, since it is larger than the sum of its proper divisors (1).

111110111100991 is an equidigital number, since it uses as much as digits as its factorization.

111110111100991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81, while the sum is 28.

The spelling of 111110111100991 in words is "one hundred eleven trillion, one hundred ten billion, one hundred eleven million, one hundred thousand, nine hundred ninety-one".