311131312 has 10 divisors (see below), whose sum is σ = 602816948. Its totient is φ = 155565648.

The previous prime is 311131277. The next prime is 311131313. The reversal of 311131312 is 213131113.

It is a Harshad number since it is a multiple of its sum of digits (16), and also a Moran number because the ratio is a prime number: 19445707 = 311131312 / (3 + 1 + 1 + 1 + 3 + 1 + 3 + 1 + 2).

It is not an unprimeable number, because it can be changed into a prime (311131313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9722838 + ... + 9722869.

Almost surely, 2^311131312 is an apocalyptic number.

It is an amenable number.

311131312 is a deficient number, since it is larger than the sum of its proper divisors (291685636).

311131312 is a wasteful number, since it uses less digits than its factorization.

311131312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19445715 (or 19445709 counting only the distinct ones).

The product of its digits is 54, while the sum is 16.

The square root of 311131312 is about 17638.9147058429. The cubic root of 311131312 is about 677.6122366853.

Adding to 311131312 its reverse (213131113), we get a palindrome (524262425).

The spelling of 311131312 in words is "three hundred eleven million, one hundred thirty-one thousand, three hundred twelve".