349217657 has 2 divisors, whose sum is σ = 349217658. Its totient is φ = 349217656.

The previous prime is 349217651. The next prime is 349217747. The reversal of 349217657 is 756712943.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 302377321 + 46840336 = 17389^2 + 6844^2 .

It is a cyclic number.

It is not a de Polignac number, because 349217657 - 2⁶ = 349217593 is a prime.

It is not a weakly prime, because it can be changed into another prime (349217651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 174608828 + 174608829.

It is an arithmetic number, because the mean of its divisors is an integer number (174608829).

Almost surely, 2^349217657 is an apocalyptic number.

It is an amenable number.

349217657 is a deficient number, since it is larger than the sum of its proper divisors (1).

349217657 is an equidigital number, since it uses as much as digits as its factorization.

349217657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 317520, while the sum is 44.

The square root of 349217657 is about 18687.3662403240. The cubic root of 349217657 is about 704.2043953097.

The spelling of 349217657 in words is "three hundred forty-nine million, two hundred seventeen thousand, six hundred fifty-seven".