111120111209 has 6 divisors (see below), whose sum is σ = 116161477866. Its totient is φ = 106288801520.

The previous prime is 111120111203. The next prime is 111120111239. The reversal of 111120111209 is 902111021111.

It can be written as a sum of positive squares in only one way, i.e., 58600305625 + 52519805584 = 242075^2 + 229172^2 .

It is a de Polignac number, because none of the positive numbers 2^k-111120111209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111120111203) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 105027932 + ... + 105028989.

It is an arithmetic number, because the mean of its divisors is an integer number (19360246311).

Almost surely, 2^111120111209 is an apocalyptic number.

It is an amenable number.

111120111209 is a deficient number, since it is larger than the sum of its proper divisors (5041366657).

111120111209 is an equidigital number, since it uses as much as digits as its factorization.

111120111209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210056967 (or 210056944 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 20.

The spelling of 111120111209 in words is "one hundred eleven billion, one hundred twenty million, one hundred eleven thousand, two hundred nine".