311228 has 12 divisors (see below), whose sum is σ = 563640. Its totient is φ = 150192.

The previous prime is 311203. The next prime is 311237. The reversal of 311228 is 822113.

It is a congruent number.

It is an unprimeable number.

311228 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 (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1226 + ... + 1457.

It is an arithmetic number, because the mean of its divisors is an integer number (46970).

2³¹¹²²⁸ is an apocalyptic number.

It is an amenable number.

311228 is a deficient number, since it is larger than the sum of its proper divisors (252412).

311228 is a wasteful number, since it uses less digits than its factorization.

311228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2716 (or 2714 counting only the distinct ones).

The product of its digits is 96, while the sum is 17.

The square root of 311228 is about 557.8781228907. The cubic root of 311228 is about 67.7682421613.

The spelling of 311228 in words is "three hundred eleven thousand, two hundred twenty-eight".