1312311317 has 2 divisors, whose sum is σ = 1312311318. Its totient is φ = 1312311316.

The previous prime is 1312311283. The next prime is 1312311331. The reversal of 1312311317 is 7131132131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1188456676 + 123854641 = 34474^2 + 11129^2 .

It is an emirp because it is prime and its reverse (7131132131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1312311317 - 2⁸ = 1312311061 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1312311292 and 1312311301.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1312311337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656155658 + 656155659.

It is an arithmetic number, because the mean of its divisors is an integer number (656155659).

Almost surely, 2^1312311317 is an apocalyptic number.

It is an amenable number.

1312311317 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312311317 is an equidigital number, since it uses as much as digits as its factorization.

1312311317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 378, while the sum is 23.

The square root of 1312311317 is about 36225.8376990788. The cubic root of 1312311317 is about 1094.8273163745.

Adding to 1312311317 its reverse (7131132131), we get a palindrome (8443443448).

The spelling of 1312311317 in words is "one billion, three hundred twelve million, three hundred eleven thousand, three hundred seventeen".