1311446320505 has 4 divisors (see below), whose sum is σ = 1573735584612. Its totient is φ = 1049157056400.

The previous prime is 1311446320487. The next prime is 1311446320517. The reversal of 1311446320505 is 5050236441131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1024127808064 + 287318512441 = 1011992^2 + 536021^2 .

It is not a de Polignac number, because 1311446320505 - 2¹⁸ = 1311446058361 is a prime.

It is a super-2 number, since 2×1311446320505² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 131144632046 + ... + 131144632055.

It is an arithmetic number, because the mean of its divisors is an integer number (393433896153).

Almost surely, 2^{1311446320505} is an apocalyptic number.

It is an amenable number.

1311446320505 is a deficient number, since it is larger than the sum of its proper divisors (262289264107).

1311446320505 is an equidigital number, since it uses as much as digits as its factorization.

1311446320505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262289264106.

The product of its (nonzero) digits is 43200, while the sum is 35.

The spelling of 1311446320505 in words is "one trillion, three hundred eleven billion, four hundred forty-six million, three hundred twenty thousand, five hundred five".