213399209 has 2 divisors, whose sum is σ = 213399210. Its totient is φ = 213399208.

The previous prime is 213399161. The next prime is 213399227. The reversal of 213399209 is 902993312.

213399209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 207504025 + 5895184 = 14405^2 + 2428^2 .

It is a cyclic number.

It is not a de Polignac number, because 213399209 - 2¹² = 213395113 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (213399229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106699604 + 106699605.

It is an arithmetic number, because the mean of its divisors is an integer number (106699605).

Almost surely, 2^213399209 is an apocalyptic number.

It is an amenable number.

213399209 is a deficient number, since it is larger than the sum of its proper divisors (1).

213399209 is an equidigital number, since it uses as much as digits as its factorization.

213399209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26244, while the sum is 38.

The square root of 213399209 is about 14608.1897920310. The cubic root of 213399209 is about 597.5821297792.

The spelling of 213399209 in words is "two hundred thirteen million, three hundred ninety-nine thousand, two hundred nine".