311131322213 has 4 divisors (see below), whose sum is σ = 313402353900. Its totient is φ = 308860290528.

The previous prime is 311131322209. The next prime is 311131322221. The reversal of 311131322213 is 312223131113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 312223131113 = 8837 ⋅35331349.

It can be written as a sum of positive squares in 2 ways, for example, as 68611515844 + 242519806369 = 261938^2 + 492463^2 .

It is a cyclic number.

It is not a de Polignac number, because 311131322213 - 2² = 311131322209 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311131322233) 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, 1135515638 + ... + 1135515911.

It is an arithmetic number, because the mean of its divisors is an integer number (78350588475).

Almost surely, 2^311131322213 is an apocalyptic number.

It is an amenable number.

311131322213 is a deficient number, since it is larger than the sum of its proper divisors (2271031687).

311131322213 is a wasteful number, since it uses less digits than its factorization.

311131322213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2271031686.

The product of its digits is 648, while the sum is 23.

Adding to 311131322213 its reverse (312223131113), we get a palindrome (623354453326).

The spelling of 311131322213 in words is "three hundred eleven billion, one hundred thirty-one million, three hundred twenty-two thousand, two hundred thirteen".