311312320311331 has 4 divisors (see below), whose sum is σ = 311321112741472. Its totient is φ = 311303527881192.

The previous prime is 311312320311281. The next prime is 311312320311397. The reversal of 311312320311331 is 133113023213113.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 311312320311331 - 2¹⁹ = 311312319787043 is a prime.

It is a super-2 number, since 2×311312320311331² (a number of 30 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 311312320311331.

It is not an unprimeable number, because it can be changed into a prime (311312320311431) 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, 4396161960 + ... + 4396232773.

It is an arithmetic number, because the mean of its divisors is an integer number (77830278185368).

Almost surely, 2^{311312320311331} is an apocalyptic number.

311312320311331 is a deficient number, since it is larger than the sum of its proper divisors (8792430141).

311312320311331 is an equidigital number, since it uses as much as digits as its factorization.

311312320311331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8792430140.

The product of its (nonzero) digits is 2916, while the sum is 28.

Adding to 311312320311331 its reverse (133113023213113), we get a palindrome (444425343524444).

The spelling of 311312320311331 in words is "three hundred eleven trillion, three hundred twelve billion, three hundred twenty million, three hundred eleven thousand, three hundred thirty-one".