111111101911 has 2 divisors, whose sum is σ = 111111101912. Its totient is φ = 111111101910.

The previous prime is 111111101909. The next prime is 111111101921. The reversal of 111111101911 is 119101111111.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 111111101911 - 2¹ = 111111101909 is a prime.

Together with 111111101909, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111111101921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55555550955 + 55555550956.

It is an arithmetic number, because the mean of its divisors is an integer number (55555550956).

Almost surely, 2^111111101911 is an apocalyptic number.

111111101911 is a deficient number, since it is larger than the sum of its proper divisors (1).

111111101911 is an equidigital number, since it uses as much as digits as its factorization.

111111101911 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 19.

The spelling of 111111101911 in words is "one hundred eleven billion, one hundred eleven million, one hundred one thousand, nine hundred eleven".