1312543678717 has 2 divisors, whose sum is σ = 1312543678718. Its totient is φ = 1312543678716.

The previous prime is 1312543678631. The next prime is 1312543678727. The reversal of 1312543678717 is 7178763452131.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1312424563321 + 119115396 = 1145611^2 + 10914^2 .

It is a cyclic number.

It is not a de Polignac number, because 1312543678717 - 2¹¹ = 1312543676669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1312543678727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656271839358 + 656271839359.

It is an arithmetic number, because the mean of its divisors is an integer number (656271839359).

Almost surely, 2^{1312543678717} is an apocalyptic number.

It is an amenable number.

1312543678717 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312543678717 is an equidigital number, since it uses as much as digits as its factorization.

1312543678717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5927040, while the sum is 55.

The spelling of 1312543678717 in words is "one trillion, three hundred twelve billion, five hundred forty-three million, six hundred seventy-eight thousand, seven hundred seventeen".