311312320331 has 4 divisors (see below), whose sum is σ = 311394313152. Its totient is φ = 311230327512.

The previous prime is 311312320273. The next prime is 311312320349. The reversal of 311312320331 is 133023213113.

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 311312320331 - 2²² = 311308126027 is a prime.

It is a super-2 number, since 2×311312320331² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 311312320297 and 311312320306.

It is not an unprimeable number, because it can be changed into a prime (311312328331) 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, 40990715 + ... + 40998308.

It is an arithmetic number, because the mean of its divisors is an integer number (77848578288).

Almost surely, 2^311312320331 is an apocalyptic number.

311312320331 is a deficient number, since it is larger than the sum of its proper divisors (81992821).

311312320331 is an equidigital number, since it uses as much as digits as its factorization.

311312320331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81992820.

The product of its (nonzero) digits is 972, while the sum is 23.

Adding to 311312320331 its reverse (133023213113), we get a palindrome (444335533444).

The spelling of 311312320331 in words is "three hundred eleven billion, three hundred twelve million, three hundred twenty thousand, three hundred thirty-one".