11100111000991 has 2 divisors, whose sum is σ = 11100111000992. Its totient is φ = 11100111000990.

The previous prime is 11100111000967. The next prime is 11100111001087. The reversal of 11100111000991 is 19900011100111.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11100111000991 - 2⁷ = 11100111000863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11100111009991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5550055500495 + 5550055500496.

It is an arithmetic number, because the mean of its divisors is an integer number (5550055500496).

Almost surely, 2^{11100111000991} is an apocalyptic number.

11100111000991 is a deficient number, since it is larger than the sum of its proper divisors (1).

11100111000991 is an equidigital number, since it uses as much as digits as its factorization.

11100111000991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81, while the sum is 25.

The spelling of 11100111000991 in words is "eleven trillion, one hundred billion, one hundred eleven million, nine hundred ninety-one", and thus it is an aban number.