31131322311 has 4 divisors (see below), whose sum is σ = 41508429752. Its totient is φ = 20754214872.

The previous prime is 31131322291. The next prime is 31131322333. The reversal of 31131322311 is 11322313113.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 31131322311 - 2¹¹ = 31131320263 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 (31131322111) 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, 5188553716 + ... + 5188553721.

It is an arithmetic number, because the mean of its divisors is an integer number (10377107438).

Almost surely, 2^31131322311 is an apocalyptic number.

31131322311 is a deficient number, since it is larger than the sum of its proper divisors (10377107441).

31131322311 is a wasteful number, since it uses less digits than its factorization.

31131322311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10377107440.

The product of its digits is 324, while the sum is 21.

Adding to 31131322311 its reverse (11322313113), we get a palindrome (42453635424).

The spelling of 31131322311 in words is "thirty-one billion, one hundred thirty-one million, three hundred twenty-two thousand, three hundred eleven".