216217117 has 2 divisors, whose sum is σ = 216217118. Its totient is φ = 216217116.

The previous prime is 216217039. The next prime is 216217129. The reversal of 216217117 is 711712612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 108597241 + 107619876 = 10421^2 + 10374^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216217117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216217217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108108558 + 108108559.

It is an arithmetic number, because the mean of its divisors is an integer number (108108559).

Almost surely, 2^216217117 is an apocalyptic number.

It is an amenable number.

216217117 is a deficient number, since it is larger than the sum of its proper divisors (1).

216217117 is an equidigital number, since it uses as much as digits as its factorization.

216217117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1176, while the sum is 28.

The square root of 216217117 is about 14704.3230718044. The cubic root of 216217117 is about 600.2009669389.

Adding to 216217117 its reverse (711712612), we get a palindrome (927929729).

The spelling of 216217117 in words is "two hundred sixteen million, two hundred seventeen thousand, one hundred seventeen".