1312315908881 has 2 divisors, whose sum is σ = 1312315908882. Its totient is φ = 1312315908880.

The previous prime is 1312315908877. The next prime is 1312315908971. The reversal of 1312315908881 is 1888095132131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1181699443600 + 130616465281 = 1087060^2 + 361409^2 .

It is a cyclic number.

It is not a de Polignac number, because 1312315908881 - 2² = 1312315908877 is a prime.

It is a super-2 number, since 2×1312315908881² (a number of 25 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1312315958881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656157954440 + 656157954441.

It is an arithmetic number, because the mean of its divisors is an integer number (656157954441).

Almost surely, 2^{1312315908881} is an apocalyptic number.

It is an amenable number.

1312315908881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312315908881 is an equidigital number, since it uses as much as digits as its factorization.

1312315908881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 414720, while the sum is 50.

The spelling of 1312315908881 in words is "one trillion, three hundred twelve billion, three hundred fifteen million, nine hundred eight thousand, eight hundred eighty-one".