217340329 has 2 divisors, whose sum is σ = 217340330. Its totient is φ = 217340328.

The previous prime is 217340311. The next prime is 217340341. The reversal of 217340329 is 923043712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 167961600 + 49378729 = 12960^2 + 7027^2 .

It is a cyclic number.

It is not a de Polignac number, because 217340329 - 2⁹ = 217339817 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 217340329.

It is not a weakly prime, because it can be changed into another prime (217340369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108670164 + 108670165.

It is an arithmetic number, because the mean of its divisors is an integer number (108670165).

Almost surely, 2^217340329 is an apocalyptic number.

It is an amenable number.

217340329 is a deficient number, since it is larger than the sum of its proper divisors (1).

217340329 is an equidigital number, since it uses as much as digits as its factorization.

217340329 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 217340329 is about 14742.4668559912. The cubic root of 217340329 is about 601.2384871939.

The spelling of 217340329 in words is "two hundred seventeen million, three hundred forty thousand, three hundred twenty-nine".