2160209 has 2 divisors, whose sum is σ = 2160210. Its totient is φ = 2160208.

The previous prime is 2160203. The next prime is 2160211. The reversal of 2160209 is 9020612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1697809 + 462400 = 1303^2 + 680^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2160209 is a prime.

It is a Sophie Germain prime.

Together with 2160211, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2160203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1080104 + 1080105.

It is an arithmetic number, because the mean of its divisors is an integer number (1080105).

2^2160209 is an apocalyptic number.

It is an amenable number.

2160209 is a deficient number, since it is larger than the sum of its proper divisors (1).

2160209 is an equidigital number, since it uses as much as digits as its factorization.

2160209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 2160209 is about 1469.7649471939. The cubic root of 2160209 is about 129.2702504975.

The spelling of 2160209 in words is "two million, one hundred sixty thousand, two hundred nine".