349688809 has 2 divisors, whose sum is σ = 349688810. Its totient is φ = 349688808.

The previous prime is 349688791. The next prime is 349688821. The reversal of 349688809 is 908886943.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 271755225 + 77933584 = 16485^2 + 8828^2 .

It is an emirp because it is prime and its reverse (908886943) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 349688809 - 2¹⁹ = 349164521 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 349688809.

It is not a weakly prime, because it can be changed into another prime (349688869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 174844404 + 174844405.

It is an arithmetic number, because the mean of its divisors is an integer number (174844405).

Almost surely, 2^349688809 is an apocalyptic number.

It is an amenable number.

349688809 is a deficient number, since it is larger than the sum of its proper divisors (1).

349688809 is an equidigital number, since it uses as much as digits as its factorization.

349688809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2985984, while the sum is 55.

The square root of 349688809 is about 18699.9681550531. The cubic root of 349688809 is about 704.5209488044.

The spelling of 349688809 in words is "three hundred forty-nine million, six hundred eighty-eight thousand, eight hundred nine".