11011100010991 has 2 divisors, whose sum is σ = 11011100010992. Its totient is φ = 11011100010990.

The previous prime is 11011100010973. The next prime is 11011100011049. The reversal of 11011100010991 is 19901000111011.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11011100010991 - 2⁴¹ = 8812076755439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11011100410991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5505550005495 + 5505550005496.

It is an arithmetic number, because the mean of its divisors is an integer number (5505550005496).

Almost surely, 2^{11011100010991} is an apocalyptic number.

11011100010991 is a deficient number, since it is larger than the sum of its proper divisors (1).

11011100010991 is an equidigital number, since it uses as much as digits as its factorization.

11011100010991 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 11011100010991 in words is "eleven trillion, eleven billion, one hundred million, ten thousand, nine hundred ninety-one".