311312320321 has 4 divisors (see below), whose sum is σ = 316415801044. Its totient is φ = 306208839600.

The previous prime is 311312320273. The next prime is 311312320349. The reversal of 311312320321 is 123023213113.

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 15398079921 + 295914240400 = 124089^2 + 543980^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-311312320321 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 311312320292 and 311312320301.

It is not an unprimeable number, because it can be changed into a prime (311312320421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2551740270 + ... + 2551740391.

It is an arithmetic number, because the mean of its divisors is an integer number (79103950261).

Almost surely, 2^311312320321 is an apocalyptic number.

It is an amenable number.

311312320321 is a deficient number, since it is larger than the sum of its proper divisors (5103480723).

311312320321 is an equidigital number, since it uses as much as digits as its factorization.

311312320321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5103480722.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 311312320321 its reverse (123023213113), we get a palindrome (434335533434).

The spelling of 311312320321 in words is "three hundred eleven billion, three hundred twelve million, three hundred twenty thousand, three hundred twenty-one".