1311217 has 2 divisors, whose sum is σ = 1311218. Its totient is φ = 1311216.

The previous prime is 1311181. The next prime is 1311223. The reversal of 1311217 is 7121131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1175056 + 136161 = 1084^2 + 369^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1311217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1311217.

It is not a weakly prime, because it can be changed into another prime (1311287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655608 + 655609.

It is an arithmetic number, because the mean of its divisors is an integer number (655609).

2^1311217 is an apocalyptic number.

It is an amenable number.

1311217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311217 is an equidigital number, since it uses as much as digits as its factorization.

1311217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42, while the sum is 16.

The square root of 1311217 is about 1145.0838397253. The cubic root of 1311217 is about 109.4522911643.

Adding to 1311217 its reverse (7121131), we get a palindrome (8432348).

The spelling of 1311217 in words is "one million, three hundred eleven thousand, two hundred seventeen".