216608317 has 2 divisors, whose sum is σ = 216608318. Its totient is φ = 216608316.

The previous prime is 216608281. The next prime is 216608321. The reversal of 216608317 is 713806612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 211382521 + 5225796 = 14539^2 + 2286^2 .

It is a cyclic number.

It is not a de Polignac number, because 216608317 - 2¹⁵ = 216575549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216602317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108304158 + 108304159.

It is an arithmetic number, because the mean of its divisors is an integer number (108304159).

Almost surely, 2^216608317 is an apocalyptic number.

It is an amenable number.

216608317 is a deficient number, since it is larger than the sum of its proper divisors (1).

216608317 is an equidigital number, since it uses as much as digits as its factorization.

216608317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 216608317 is about 14717.6192707924. The cubic root of 216608317 is about 600.5627285441.

The spelling of 216608317 in words is "two hundred sixteen million, six hundred eight thousand, three hundred seventeen".