111111111109 has 4 divisors (see below), whose sum is σ = 111303678604. Its totient is φ = 110918543616.

The previous prime is 111111111103. The next prime is 111111111149. The reversal of 111111111109 is 901111111111.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 99826298209 + 11284812900 = 315953^2 + 106230^2 .

It is a cyclic number.

It is not a de Polignac number, because 111111111109 - 2³ = 111111111101 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 (111111111101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96282882 + ... + 96284035.

It is an arithmetic number, because the mean of its divisors is an integer number (27825919651).

Almost surely, 2^111111111109 is an apocalyptic number.

It is an amenable number.

111111111109 is a deficient number, since it is larger than the sum of its proper divisors (192567495).

111111111109 is an equidigital number, since it uses as much as digits as its factorization.

111111111109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192567494.

The product of its (nonzero) digits is 9, while the sum is 19.

The spelling of 111111111109 in words is "one hundred eleven billion, one hundred eleven million, one hundred eleven thousand, one hundred nine".