110111109991 has 2 divisors, whose sum is σ = 110111109992. Its totient is φ = 110111109990.

The previous prime is 110111109973. The next prime is 110111110019. The reversal of 110111109991 is 199901111011.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 110111109991 - 2⁷ = 110111109863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (110111109491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55055554995 + 55055554996.

It is an arithmetic number, because the mean of its divisors is an integer number (55055554996).

Almost surely, 2^110111109991 is an apocalyptic number.

110111109991 is a deficient number, since it is larger than the sum of its proper divisors (1).

110111109991 is an equidigital number, since it uses as much as digits as its factorization.

110111109991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 729, while the sum is 34.

The spelling of 110111109991 in words is "one hundred ten billion, one hundred eleven million, one hundred nine thousand, nine hundred ninety-one".