1311681313 has 2 divisors, whose sum is σ = 1311681314. Its totient is φ = 1311681312.

The previous prime is 1311681263. The next prime is 1311681337. The reversal of 1311681313 is 3131861131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1301261329 + 10419984 = 36073^2 + 3228^2 .

It is a cyclic number.

It is not a de Polignac number, because 1311681313 - 2⁹ = 1311680801 is a prime.

It is not a weakly prime, because it can be changed into another prime (1311681373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655840656 + 655840657.

It is an arithmetic number, because the mean of its divisors is an integer number (655840657).

Almost surely, 2^1311681313 is an apocalyptic number.

It is an amenable number.

1311681313 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311681313 is an equidigital number, since it uses as much as digits as its factorization.

1311681313 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 28.

The square root of 1311681313 is about 36217.1411489090. The cubic root of 1311681313 is about 1094.6520896619.

The spelling of 1311681313 in words is "one billion, three hundred eleven million, six hundred eighty-one thousand, three hundred thirteen".