12517217 has 2 divisors, whose sum is σ = 12517218. Its totient is φ = 12517216.

The previous prime is 12517199. The next prime is 12517231. The reversal of 12517217 is 71271521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12327121 + 190096 = 3511^2 + 436^2 .

It is a cyclic number.

It is not a de Polignac number, because 12517217 - 2⁸ = 12516961 is a prime.

It is not a weakly prime, because it can be changed into another prime (12517277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6258608 + 6258609.

It is an arithmetic number, because the mean of its divisors is an integer number (6258609).

Almost surely, 2^12517217 is an apocalyptic number.

It is an amenable number.

12517217 is a deficient number, since it is larger than the sum of its proper divisors (1).

12517217 is an equidigital number, since it uses as much as digits as its factorization.

12517217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 980, while the sum is 26.

The square root of 12517217 is about 3537.9679195832. The cubic root of 12517217 is about 232.1859451110.

Adding to 12517217 its reverse (71271521), we get a palindrome (83788738).

The spelling of 12517217 in words is "twelve million, five hundred seventeen thousand, two hundred seventeen".