111189109 has 2 divisors, whose sum is σ = 111189110. Its totient is φ = 111189108.

The previous prime is 111189097. The next prime is 111189131. The reversal of 111189109 is 901981111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70930084 + 40259025 = 8422^2 + 6345^2 .

It is an emirp because it is prime and its reverse (901981111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111189109 - 2⁵ = 111189077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111189139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55594554 + 55594555.

It is an arithmetic number, because the mean of its divisors is an integer number (55594555).

Almost surely, 2^111189109 is an apocalyptic number.

It is an amenable number.

111189109 is a deficient number, since it is larger than the sum of its proper divisors (1).

111189109 is an equidigital number, since it uses as much as digits as its factorization.

111189109 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 31.

The square root of 111189109 is about 10544.6246495549. The cubic root of 111189109 is about 480.8623228786.

It can be divided in two parts, 1111 and 89109, that multiplied together give a palindrome (99000099).

The spelling of 111189109 in words is "one hundred eleven million, one hundred eighty-nine thousand, one hundred nine".