2111303209 has 4 divisors (see below), whose sum is σ = 2118509316. Its totient is φ = 2104097104.

The previous prime is 2111303191. The next prime is 2111303221. The reversal of 2111303209 is 9023031112.

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 1988714025 + 122589184 = 44595^2 + 11072^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2111303209 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2111303209.

It is not an unprimeable number, because it can be changed into a prime (2111303809) 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, 3602614 + ... + 3603199.

It is an arithmetic number, because the mean of its divisors is an integer number (529627329).

Almost surely, 2^2111303209 is an apocalyptic number.

It is an amenable number.

2111303209 is a deficient number, since it is larger than the sum of its proper divisors (7206107).

2111303209 is an equidigital number, since it uses as much as digits as its factorization.

2111303209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7206106.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 2111303209 is about 45948.9195629233. The cubic root of 2111303209 is about 1282.8726191898.

The spelling of 2111303209 in words is "two billion, one hundred eleven million, three hundred three thousand, two hundred nine".