11112111091 has 2 divisors, whose sum is σ = 11112111092. Its totient is φ = 11112111090.

The previous prime is 11112111089. The next prime is 11112111133. The reversal of 11112111091 is 19011121111.

It is a weak prime.

It is an emirp because it is prime and its reverse (19011121111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11112111091 - 2¹ = 11112111089 is a prime.

Together with 11112111089, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (11112111011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5556055545 + 5556055546.

It is an arithmetic number, because the mean of its divisors is an integer number (5556055546).

Almost surely, 2^11112111091 is an apocalyptic number.

11112111091 is a deficient number, since it is larger than the sum of its proper divisors (1).

11112111091 is an equidigital number, since it uses as much as digits as its factorization.

11112111091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18, while the sum is 19.

The spelling of 11112111091 in words is "eleven billion, one hundred twelve million, one hundred eleven thousand, ninety-one".