311320212 has 24 divisors (see below), whose sum is σ = 830187456. Its totient is φ = 88948608.

The previous prime is 311320171. The next prime is 311320213. The reversal of 311320212 is 212023113.

It is a junction number, because it is equal to n+sod(n) for n = 311320191 and 311320200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311320213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1853013 + ... + 1853180.

It is an arithmetic number, because the mean of its divisors is an integer number (34591144).

Almost surely, 2^311320212 is an apocalyptic number.

It is an amenable number.

311320212 is an abundant number, since it is smaller than the sum of its proper divisors (518867244).

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

311320212 is a wasteful number, since it uses less digits than its factorization.

311320212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3706207 (or 3706205 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 311320212 is about 17644.2685311690. The cubic root of 311320212 is about 677.7493439135.

Adding to 311320212 its reverse (212023113), we get a palindrome (523343325).

The spelling of 311320212 in words is "three hundred eleven million, three hundred twenty thousand, two hundred twelve".