343490209 has 2 divisors, whose sum is σ = 343490210. Its totient is φ = 343490208.

The previous prime is 343490141. The next prime is 343490221. The reversal of 343490209 is 902094343.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 300259584 + 43230625 = 17328^2 + 6575^2 .

It is an emirp because it is prime and its reverse (902094343) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 343490209 - 2⁹ = 343489697 is a prime.

It is not a weakly prime, because it can be changed into another prime (343491209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171745104 + 171745105.

It is an arithmetic number, because the mean of its divisors is an integer number (171745105).

Almost surely, 2^343490209 is an apocalyptic number.

It is an amenable number.

343490209 is a deficient number, since it is larger than the sum of its proper divisors (1).

343490209 is an equidigital number, since it uses as much as digits as its factorization.

343490209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 34.

The square root of 343490209 is about 18533.4888512660. The cubic root of 343490209 is about 700.3333167706. Note that the first 4 decimals are identical.

The spelling of 343490209 in words is "three hundred forty-three million, four hundred ninety thousand, two hundred nine".