11111111101091 has 16 divisors (see below), whose sum is σ = 11169897396000. Its totient is φ = 11052505479168.

The previous prime is 11111111101003. The next prime is 11111111101099. The reversal of 11111111101091 is 19010111111111.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11111111101091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11111111101099) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 306672965 + ... + 306709193.

It is an arithmetic number, because the mean of its divisors is an integer number (698118587250).

Almost surely, 2^{11111111101091} is an apocalyptic number.

11111111101091 is a deficient number, since it is larger than the sum of its proper divisors (58786294909).

11111111101091 is a wasteful number, since it uses less digits than its factorization.

11111111101091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38678.

The product of its (nonzero) digits is 9, while the sum is 20.

The spelling of 11111111101091 in words is "eleven trillion, one hundred eleven billion, one hundred eleven million, one hundred one thousand, ninety-one".