11111001191 has 2 divisors, whose sum is σ = 11111001192. Its totient is φ = 11111001190.

The previous prime is 11111001179. The next prime is 11111001227. The reversal of 11111001191 is 19110011111.

It is a weak prime.

It is an emirp because it is prime and its reverse (19110011111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11111001191 - 2³⁰ = 10037259367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11111001791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5555500595 + 5555500596.

It is an arithmetic number, because the mean of its divisors is an integer number (5555500596).

Almost surely, 2^11111001191 is an apocalyptic number.

11111001191 is a deficient number, since it is larger than the sum of its proper divisors (1).

11111001191 is an equidigital number, since it uses as much as digits as its factorization.

11111001191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9, while the sum is 17.

The spelling of 11111001191 in words is "eleven billion, one hundred eleven million, one thousand, one hundred ninety-one".