311812 has 12 divisors (see below), whose sum is σ = 550620. Its totient is φ = 154496.

The previous prime is 311807. The next prime is 311821. The reversal of 311812 is 218113.

It can be written as a sum of positive squares in 2 ways, for example, as 112896 + 198916 = 336^2 + 446^2 .

It is an unprimeable number.

311812 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 264 + ... + 832.

It is an arithmetic number, because the mean of its divisors is an integer number (45885).

2³¹¹⁸¹² is an apocalyptic number.

It is an amenable number.

311812 is a deficient number, since it is larger than the sum of its proper divisors (238808).

311812 is a wasteful number, since it uses less digits than its factorization.

311812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 710 (or 708 counting only the distinct ones).

The product of its digits is 48, while the sum is 16.

The square root of 311812 is about 558.4012893968. The cubic root of 311812 is about 67.8106033080.

Adding to 311812 its reverse (218113), we get a palindrome (529925).

The spelling of 311812 in words is "three hundred eleven thousand, eight hundred twelve".