11091911111 has 2 divisors, whose sum is σ = 11091911112. Its totient is φ = 11091911110.

The previous prime is 11091911107. The next prime is 11091911113. The reversal of 11091911111 is 11111919011.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11091911111 - 2² = 11091911107 is a prime.

Together with 11091911113, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11091911113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5545955555 + 5545955556.

It is an arithmetic number, because the mean of its divisors is an integer number (5545955556).

Almost surely, 2^11091911111 is an apocalyptic number.

11091911111 is a deficient number, since it is larger than the sum of its proper divisors (1).

11091911111 is an equidigital number, since it uses as much as digits as its factorization.

11091911111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81, while the sum is 26.

It can be divided in two parts, 110919111 and 11, that multiplied together give a palindrome (1220110221).

The spelling of 11091911111 in words is "eleven billion, ninety-one million, nine hundred eleven thousand, one hundred eleven".