1313563515391 has 2 divisors, whose sum is σ = 1313563515392. Its totient is φ = 1313563515390.

The previous prime is 1313563515389. The next prime is 1313563515403. The reversal of 1313563515391 is 1935153653131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1313563515391 - 2¹ = 1313563515389 is a prime.

Together with 1313563515389, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1313563515191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656781757695 + 656781757696.

It is an arithmetic number, because the mean of its divisors is an integer number (656781757696).

Almost surely, 2^{1313563515391} is an apocalyptic number.

1313563515391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1313563515391 is an equidigital number, since it uses as much as digits as its factorization.

1313563515391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 546750, while the sum is 46.

The spelling of 1313563515391 in words is "one trillion, three hundred thirteen billion, five hundred sixty-three million, five hundred fifteen thousand, three hundred ninety-one".