311321320 has 32 divisors (see below), whose sum is σ = 701719200. Its totient is φ = 124307008.

The previous prime is 311321317. The next prime is 311321321. The reversal of 311321320 is 23123113.

It is a junction number, because it is equal to n+sod(n) for n = 311321294 and 311321303.

It is not an unprimeable number, because it can be changed into a prime (311321321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16851 + ... + 30109.

It is an arithmetic number, because the mean of its divisors is an integer number (21928725).

Almost surely, 2^311321320 is an apocalyptic number.

It is an amenable number.

311321320 is an abundant number, since it is smaller than the sum of its proper divisors (390397880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

311321320 is a wasteful number, since it uses less digits than its factorization.

311321320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13857 (or 13853 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 311321320 is about 17644.2999294390. The cubic root of 311321320 is about 677.7501479575.

Adding to 311321320 its reverse (23123113), we get a palindrome (334444433).

The spelling of 311321320 in words is "three hundred eleven million, three hundred twenty-one thousand, three hundred twenty".