11111056091 has 2 divisors, whose sum is σ = 11111056092. Its totient is φ = 11111056090.

The previous prime is 11111056003. The next prime is 11111056109. The reversal of 11111056091 is 19065011111.

Together with next prime (11111056109) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11111056091 - 2²⁶ = 11043947227 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11111056091.

It is not a weakly prime, because it can be changed into another prime (11111056001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5555528045 + 5555528046.

It is an arithmetic number, because the mean of its divisors is an integer number (5555528046).

Almost surely, 2^11111056091 is an apocalyptic number.

11111056091 is a deficient number, since it is larger than the sum of its proper divisors (1).

11111056091 is an equidigital number, since it uses as much as digits as its factorization.

11111056091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 270, while the sum is 26.

The spelling of 11111056091 in words is "eleven billion, one hundred eleven million, fifty-six thousand, ninety-one".