11011001109991 has 2 divisors, whose sum is σ = 11011001109992. Its totient is φ = 11011001109990.

The previous prime is 11011001109973. The next prime is 11011001110013. The reversal of 11011001109991 is 19990110011011.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11011001109991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11011001149991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5505500554995 + 5505500554996.

It is an arithmetic number, because the mean of its divisors is an integer number (5505500554996).

Almost surely, 2^{11011001109991} is an apocalyptic number.

11011001109991 is a deficient number, since it is larger than the sum of its proper divisors (1).

11011001109991 is an equidigital number, since it uses as much as digits as its factorization.

11011001109991 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 11011001109991 in words is "eleven trillion, eleven billion, one million, one hundred nine thousand, nine hundred ninety-one".