346140209 has 2 divisors, whose sum is σ = 346140210. Its totient is φ = 346140208.

The previous prime is 346140199. The next prime is 346140251. The reversal of 346140209 is 902041643.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 344919184 + 1221025 = 18572^2 + 1105^2 .

It is an emirp because it is prime and its reverse (902041643) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 346140209 - 2²⁴ = 329362993 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (346140299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 173070104 + 173070105.

It is an arithmetic number, because the mean of its divisors is an integer number (173070105).

Almost surely, 2^346140209 is an apocalyptic number.

It is an amenable number.

346140209 is a deficient number, since it is larger than the sum of its proper divisors (1).

346140209 is an equidigital number, since it uses as much as digits as its factorization.

346140209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 346140209 is about 18604.8436972741. The cubic root of 346140209 is about 702.1297105034.

The spelling of 346140209 in words is "three hundred forty-six million, one hundred forty thousand, two hundred nine".