216018317 has 2 divisors, whose sum is σ = 216018318. Its totient is φ = 216018316.

The previous prime is 216018307. The next prime is 216018331. The reversal of 216018317 is 713810612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 206813161 + 9205156 = 14381^2 + 3034^2 .

It is a cyclic number.

It is not a de Polignac number, because 216018317 - 2¹² = 216014221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 216018317.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216018307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108009158 + 108009159.

It is an arithmetic number, because the mean of its divisors is an integer number (108009159).

Almost surely, 2^216018317 is an apocalyptic number.

It is an amenable number.

216018317 is a deficient number, since it is larger than the sum of its proper divisors (1).

216018317 is an equidigital number, since it uses as much as digits as its factorization.

216018317 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 216018317 is about 14697.5616004833. The cubic root of 216018317 is about 600.0169597058.

Adding to 216018317 its reverse (713810612), we get a palindrome (929828929).

The spelling of 216018317 in words is "two hundred sixteen million, eighteen thousand, three hundred seventeen".