1216717 has 2 divisors, whose sum is σ = 1216718. Its totient is φ = 1216716.

The previous prime is 1216711. The next prime is 1216729. The reversal of 1216717 is 7176121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1196836 + 19881 = 1094^2 + 141^2 .

It is an emirp because it is prime and its reverse (7176121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1216717 - 2¹¹ = 1214669 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1216691 and 1216700.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1216711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608358 + 608359.

It is an arithmetic number, because the mean of its divisors is an integer number (608359).

2^1216717 is an apocalyptic number.

It is an amenable number.

1216717 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216717 is an equidigital number, since it uses as much as digits as its factorization.

1216717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 588, while the sum is 25.

The square root of 1216717 is about 1103.0489563025. The cubic root of 1216717 is about 106.7570403794.

The spelling of 1216717 in words is "one million, two hundred sixteen thousand, seven hundred seventeen".