311243312 has 40 divisors (see below), whose sum is σ = 629758800. Its totient is φ = 148827392.

The previous prime is 311243281. The next prime is 311243321. The reversal of 311243312 is 213342113.

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, 46514 + ... + 52782.

It is an arithmetic number, because the mean of its divisors is an integer number (15743970).

Almost surely, 2^311243312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 311243312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (314879400).

311243312 is an abundant number, since it is smaller than the sum of its proper divisors (318515488).

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

311243312 is a wasteful number, since it uses less digits than its factorization.

311243312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6413 (or 6407 counting only the distinct ones).

The product of its digits is 432, while the sum is 20.

The square root of 311243312 is about 17642.0892186838. The cubic root of 311243312 is about 677.6935351198.

Adding to 311243312 its reverse (213342113), we get a palindrome (524585425).

The spelling of 311243312 in words is "three hundred eleven million, two hundred forty-three thousand, three hundred twelve".