349393661 has 2 divisors, whose sum is σ = 349393662. Its totient is φ = 349393660.

The previous prime is 349393651. The next prime is 349393663. The reversal of 349393661 is 166393943.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 331458436 + 17935225 = 18206^2 + 4235^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-349393661 is a prime.

Together with 349393663, 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 (349393663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 174696830 + 174696831.

It is an arithmetic number, because the mean of its divisors is an integer number (174696831).

Almost surely, 2^349393661 is an apocalyptic number.

It is an amenable number.

349393661 is a deficient number, since it is larger than the sum of its proper divisors (1).

349393661 is an equidigital number, since it uses as much as digits as its factorization.

349393661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 314928, while the sum is 44.

The square root of 349393661 is about 18692.0748179543. The cubic root of 349393661 is about 704.3226806365.

The spelling of 349393661 in words is "three hundred forty-nine million, three hundred ninety-three thousand, six hundred sixty-one".