311313220 has 24 divisors (see below), whose sum is σ = 657417600. Its totient is φ = 123828192.

The previous prime is 311313181. The next prime is 311313241. The reversal of 311313220 is 22313113.

It is a junction number, because it is equal to n+sod(n) for n = 311313194 and 311313203.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39900 + ... + 47059.

It is an arithmetic number, because the mean of its divisors is an integer number (27392400).

Almost surely, 2^311313220 is an apocalyptic number.

It is an amenable number.

311313220 is an abundant number, since it is smaller than the sum of its proper divisors (346104380).

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

311313220 is a wasteful number, since it uses less digits than its factorization.

311313220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87147 (or 87145 counting only the distinct ones).

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

The square root of 311313220 is about 17644.0703920609. The cubic root of 311313220 is about 677.7442699750.

Adding to 311313220 its reverse (22313113), we get a palindrome (333626333).

The spelling of 311313220 in words is "three hundred eleven million, three hundred thirteen thousand, two hundred twenty".