349718209 has 2 divisors, whose sum is σ = 349718210. Its totient is φ = 349718208.

The previous prime is 349718167. The next prime is 349718219. The reversal of 349718209 is 902817943.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 197121600 + 152596609 = 14040^2 + 12353^2 .

It is a cyclic number.

It is not a de Polignac number, because 349718209 - 2²⁵ = 316163777 is a prime.

It is not a weakly prime, because it can be changed into another prime (349718219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 174859104 + 174859105.

It is an arithmetic number, because the mean of its divisors is an integer number (174859105).

Almost surely, 2^349718209 is an apocalyptic number.

It is an amenable number.

349718209 is a deficient number, since it is larger than the sum of its proper divisors (1).

349718209 is an equidigital number, since it uses as much as digits as its factorization.

349718209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 349718209 is about 18700.7542361264. The cubic root of 349718209 is about 704.5406923925.

The spelling of 349718209 in words is "three hundred forty-nine million, seven hundred eighteen thousand, two hundred nine".