1311396921089 has 2 divisors, whose sum is σ = 1311396921090. Its totient is φ = 1311396921088.

The previous prime is 1311396921083. The next prime is 1311396921101. The reversal of 1311396921089 is 9801296931131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 688181407489 + 623215513600 = 829567^2 + 789440^2 .

It is a cyclic number.

It is not a de Polignac number, because 1311396921089 - 2¹² = 1311396916993 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1311396921089.

It is not a weakly prime, because it can be changed into another prime (1311396921083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655698460544 + 655698460545.

It is an arithmetic number, because the mean of its divisors is an integer number (655698460545).

Almost surely, 2^{1311396921089} is an apocalyptic number.

It is an amenable number.

1311396921089 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311396921089 is an equidigital number, since it uses as much as digits as its factorization.

1311396921089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 629856, while the sum is 53.

The spelling of 1311396921089 in words is "one trillion, three hundred eleven billion, three hundred ninety-six million, nine hundred twenty-one thousand, eighty-nine".