349557917 has 2 divisors, whose sum is σ = 349557918. Its totient is φ = 349557916.

The previous prime is 349557889. The next prime is 349557919. The reversal of 349557917 is 719755943.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 241522681 + 108035236 = 15541^2 + 10394^2 .

It is a cyclic number.

It is not a de Polignac number, because 349557917 - 2⁶ = 349557853 is a prime.

Together with 349557919, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (349557919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 174778958 + 174778959.

It is an arithmetic number, because the mean of its divisors is an integer number (174778959).

Almost surely, 2^349557917 is an apocalyptic number.

It is an amenable number.

349557917 is a deficient number, since it is larger than the sum of its proper divisors (1).

349557917 is an equidigital number, since it uses as much as digits as its factorization.

349557917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1190700, while the sum is 50.

The square root of 349557917 is about 18696.4680354339. The cubic root of 349557917 is about 704.4330347678.

The spelling of 349557917 in words is "three hundred forty-nine million, five hundred fifty-seven thousand, nine hundred seventeen".