12217717 has 2 divisors, whose sum is σ = 12217718. Its totient is φ = 12217716.

The previous prime is 12217693. The next prime is 12217753. The reversal of 12217717 is 71771221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10491121 + 1726596 = 3239^2 + 1314^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12217717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12217417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6108858 + 6108859.

It is an arithmetic number, because the mean of its divisors is an integer number (6108859).

Almost surely, 2^12217717 is an apocalyptic number.

It is an amenable number.

12217717 is a deficient number, since it is larger than the sum of its proper divisors (1).

12217717 is an equidigital number, since it uses as much as digits as its factorization.

12217717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1372, while the sum is 28.

The square root of 12217717 is about 3495.3851003859. The cubic root of 12217717 is about 230.3191348018.

Adding to 12217717 its reverse (71771221), we get a palindrome (83988938).

The spelling of 12217717 in words is "twelve million, two hundred seventeen thousand, seven hundred seventeen".