311621312 has 14 divisors (see below), whose sum is σ = 618373668. Its totient is φ = 155810624.

The previous prime is 311621311. The next prime is 311621333. The reversal of 311621312 is 213126113.

It is not an unprimeable number, because it can be changed into a prime (311621311) by changing a digit.

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 as a sum of consecutive naturals, namely, 2434478 + ... + 2434605.

Almost surely, 2^311621312 is an apocalyptic number.

311621312 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

311621312 is a deficient number, since it is larger than the sum of its proper divisors (306752356).

311621312 is an equidigital number, since it uses as much as digits as its factorization.

311621312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4869095 (or 4869085 counting only the distinct ones).

The product of its digits is 216, while the sum is 20.

The square root of 311621312 is about 17652.7989848636. The cubic root of 311621312 is about 677.9677734325.

Adding to 311621312 its reverse (213126113), we get a palindrome (524747425).

The spelling of 311621312 in words is "three hundred eleven million, six hundred twenty-one thousand, three hundred twelve".