349772809 has 2 divisors, whose sum is σ = 349772810. Its totient is φ = 349772808.

The previous prime is 349772791. The next prime is 349772821. The reversal of 349772809 is 908277943.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 262537209 + 87235600 = 16203^2 + 9340^2 .

It is a cyclic number.

It is not a de Polignac number, because 349772809 - 2¹⁹ = 349248521 is a prime.

It is not a weakly prime, because it can be changed into another prime (349772849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 174886404 + 174886405.

It is an arithmetic number, because the mean of its divisors is an integer number (174886405).

Almost surely, 2^349772809 is an apocalyptic number.

It is an amenable number.

349772809 is a deficient number, since it is larger than the sum of its proper divisors (1).

349772809 is an equidigital number, since it uses as much as digits as its factorization.

349772809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 762048, while the sum is 49.

The square root of 349772809 is about 18702.2140133194. The cubic root of 349772809 is about 704.5773561206.

The spelling of 349772809 in words is "three hundred forty-nine million, seven hundred seventy-two thousand, eight hundred nine".