111818109 has 16 divisors (see below), whose sum is σ = 162959552. Its totient is φ = 67782528.

The previous prime is 111818099. The next prime is 111818117. The reversal of 111818109 is 901818111.

It is not a de Polignac number, because 111818109 - 2⁹ = 111817597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111818149) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18784 + ... + 24009.

It is an arithmetic number, because the mean of its divisors is an integer number (10184972).

Almost surely, 2^111818109 is an apocalyptic number.

It is an amenable number.

111818109 is a deficient number, since it is larger than the sum of its proper divisors (51141443).

111818109 is a wasteful number, since it uses less digits than its factorization.

111818109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42876.

The product of its (nonzero) digits is 576, while the sum is 30.

The square root of 111818109 is about 10574.4082103917. The cubic root of 111818109 is about 481.7673690754.

The spelling of 111818109 in words is "one hundred eleven million, eight hundred eighteen thousand, one hundred nine".