311303221231 has 4 divisors (see below), whose sum is σ = 311305885200. Its totient is φ = 311300557264.

The previous prime is 311303221169. The next prime is 311303221237. The reversal of 311303221231 is 132122303113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 132122303113 = 19 ⋅6953805427.

It is a cyclic number.

It is not a de Polignac number, because 311303221231 - 2¹⁷ = 311303090159 is a prime.

It is a super-2 number, since 2×311303221231² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311303221237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1148251 + ... + 1393228.

It is an arithmetic number, because the mean of its divisors is an integer number (77826471300).

Almost surely, 2^311303221231 is an apocalyptic number.

311303221231 is a deficient number, since it is larger than the sum of its proper divisors (2663969).

311303221231 is a wasteful number, since it uses less digits than its factorization.

311303221231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2663968.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 311303221231 its reverse (132122303113), we get a palindrome (443425524344).

The spelling of 311303221231 in words is "three hundred eleven billion, three hundred three million, two hundred twenty-one thousand, two hundred thirty-one".