1316635159891 has 2 divisors, whose sum is σ = 1316635159892. Its totient is φ = 1316635159890.

The previous prime is 1316635159849. The next prime is 1316635159909. The reversal of 1316635159891 is 1989515366131.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1316635159891 - 2²¹ = 1316633062739 is a prime.

It is a super-2 number, since 2×1316635159891² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1316635159811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 658317579945 + 658317579946.

It is an arithmetic number, because the mean of its divisors is an integer number (658317579946).

Almost surely, 2^{1316635159891} is an apocalyptic number.

1316635159891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1316635159891 is an equidigital number, since it uses as much as digits as its factorization.

1316635159891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5248800, while the sum is 58.

The spelling of 1316635159891 in words is "one trillion, three hundred sixteen billion, six hundred thirty-five million, one hundred fifty-nine thousand, eight hundred ninety-one".