311311221331 has 12 divisors (see below), whose sum is σ = 342200251792. Its totient is φ = 282997638000.

The previous prime is 311311221323. The next prime is 311311221349. The reversal of 311311221331 is 133122113113.

It is not a de Polignac number, because 311311221331 - 2³ = 311311221323 is a prime.

It is a super-2 number, since 2×311311221331² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (311311221301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3693721 + ... + 3777061.

Almost surely, 2^311311221331 is an apocalyptic number.

311311221331 is a deficient number, since it is larger than the sum of its proper divisors (30889030461).

311311221331 is a wasteful number, since it uses less digits than its factorization.

311311221331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114234 (or 114223 counting only the distinct ones).

The product of its digits is 324, while the sum is 22.

Adding to 311311221331 its reverse (133122113113), we get a palindrome (444433334444).

The spelling of 311311221331 in words is "three hundred eleven billion, three hundred eleven million, two hundred twenty-one thousand, three hundred thirty-one".