111109 has 2 divisors, whose sum is σ = 111110. Its totient is φ = 111108.

The previous prime is 111103. The next prime is 111119. The reversal of 111109 is 901111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 108900 + 2209 = 330^2 + 47^2 .

It is an emirp because it is prime and its reverse (901111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111109 - 2⁹ = 110597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55554 + 55555.

It is an arithmetic number, because the mean of its divisors is an integer number (55555).

2¹¹¹¹⁰⁹ is an apocalyptic number.

It is an amenable number.

111109 is a deficient number, since it is larger than the sum of its proper divisors (1).

111109 is an equidigital number, since it uses as much as digits as its factorization.

111109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9, while the sum is 13.

The square root of 111109 is about 333.3301666516. The cubic root of 111109 is about 48.0746812001.

The spelling of 111109 in words is "one hundred eleven thousand, one hundred nine".