111111109189 has 2 divisors, whose sum is σ = 111111109190. Its totient is φ = 111111109188.

The previous prime is 111111109171. The next prime is 111111109237. The reversal of 111111109189 is 981901111111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89485936164 + 21625173025 = 299142^2 + 147055^2 .

It is a cyclic number.

It is not a de Polignac number, because 111111109189 - 2⁹ = 111111108677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111111109789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55555554594 + 55555554595.

It is an arithmetic number, because the mean of its divisors is an integer number (55555554595).

Almost surely, 2^111111109189 is an apocalyptic number.

It is an amenable number.

111111109189 is a deficient number, since it is larger than the sum of its proper divisors (1).

111111109189 is an equidigital number, since it uses as much as digits as its factorization.

111111109189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 34.

The spelling of 111111109189 in words is "one hundred eleven billion, one hundred eleven million, one hundred nine thousand, one hundred eighty-nine".