1312641005491 has 2 divisors, whose sum is σ = 1312641005492. Its totient is φ = 1312641005490.

The previous prime is 1312641005483. The next prime is 1312641005519. The reversal of 1312641005491 is 1945001462131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1312641005491 - 2³ = 1312641005483 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1312641005491.

It is not a weakly prime, because it can be changed into another prime (1312641005411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656320502745 + 656320502746.

It is an arithmetic number, because the mean of its divisors is an integer number (656320502746).

Almost surely, 2^{1312641005491} is an apocalyptic number.

1312641005491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312641005491 is an equidigital number, since it uses as much as digits as its factorization.

1312641005491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 37.

The spelling of 1312641005491 in words is "one trillion, three hundred twelve billion, six hundred forty-one million, five thousand, four hundred ninety-one".