2130209 has 2 divisors, whose sum is σ = 2130210. Its totient is φ = 2130208.

The previous prime is 2130173. The next prime is 2130239. The reversal of 2130209 is 9020312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1600225 + 529984 = 1265^2 + 728^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2130209 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2130239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1065104 + 1065105.

It is an arithmetic number, because the mean of its divisors is an integer number (1065105).

2^2130209 is an apocalyptic number.

It is an amenable number.

2130209 is a deficient number, since it is larger than the sum of its proper divisors (1).

2130209 is an equidigital number, since it uses as much as digits as its factorization.

2130209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 2130209 is about 1459.5235523965. The cubic root of 2130209 is about 128.6690432712.

The spelling of 2130209 in words is "two million, one hundred thirty thousand, two hundred nine".