311131111213 has 8 divisors (see below), whose sum is σ = 338518545848. Its totient is φ = 284237144064.

The previous prime is 311131111171. The next prime is 311131111231. The reversal of 311131111213 is 312111131113.

It can be written as a sum of positive squares in 4 ways, for example, as 43638374404 + 267492736809 = 208898^2 + 517197^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 311131111213 - 2⁹ = 311131110701 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 (311131111273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123365556 + ... + 123368077.

It is an arithmetic number, because the mean of its divisors is an integer number (42314818231).

Almost surely, 2^311131111213 is an apocalyptic number.

It is an amenable number.

311131111213 is a deficient number, since it is larger than the sum of its proper divisors (27387434635).

311131111213 is a wasteful number, since it uses less digits than its factorization.

311131111213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246733743.

The product of its digits is 54, while the sum is 19.

Adding to 311131111213 its reverse (312111131113), we get a palindrome (623242242326).

The spelling of 311131111213 in words is "three hundred eleven billion, one hundred thirty-one million, one hundred eleven thousand, two hundred thirteen".