1311323320331 has 4 divisors (see below), whose sum is σ = 1312058781072. Its totient is φ = 1310587859592.

The previous prime is 1311323320259. The next prime is 1311323320403. The reversal of 1311323320331 is 1330233231131.

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

It is an interprime number because it is at equal distance from previous prime (1311323320259) and next prime (1311323320403).

It is a cyclic number.

It is not a de Polignac number, because 1311323320331 - 2¹⁴ = 1311323303947 is a prime.

It is a super-2 number, since 2×1311323320331² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1311323320331.

It is not an unprimeable number, because it can be changed into a prime (1311323320031) 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 in 3 ways as a sum of consecutive naturals, for example, 367727696 + ... + 367731261.

It is an arithmetic number, because the mean of its divisors is an integer number (328014695268).

Almost surely, 2^{1311323320331} is an apocalyptic number.

1311323320331 is a deficient number, since it is larger than the sum of its proper divisors (735460741).

1311323320331 is an equidigital number, since it uses as much as digits as its factorization.

1311323320331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 735460740.

The product of its (nonzero) digits is 2916, while the sum is 26.

Adding to 1311323320331 its reverse (1330233231131), we get a palindrome (2641556551462).

The spelling of 1311323320331 in words is "one trillion, three hundred eleven billion, three hundred twenty-three million, three hundred twenty thousand, three hundred thirty-one".