2011111209 has 12 divisors (see below), whose sum is σ = 2983450756. Its totient is φ = 1304504352.

The previous prime is 2011111181. The next prime is 2011111231. The reversal of 2011111209 is 9021111102.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1723910400 + 287200809 = 41520^2 + 16947^2 .

It is not a de Polignac number, because 2011111209 - 2⁵ = 2011111177 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2011111191 and 2011111200.

It is not an unprimeable number, because it can be changed into a prime (2011110209) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3019354 + ... + 3020019.

Almost surely, 2^2011111209 is an apocalyptic number.

It is an amenable number.

2011111209 is a deficient number, since it is larger than the sum of its proper divisors (972339547).

2011111209 is a wasteful number, since it uses less digits than its factorization.

2011111209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6039416 (or 6039413 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 18.

The square root of 2011111209 is about 44845.4145816493. The cubic root of 2011111209 is about 1262.2499500734.

The spelling of 2011111209 in words is "two billion, eleven million, one hundred eleven thousand, two hundred nine".