31223311131 has 16 divisors (see below), whose sum is σ = 41808718368. Its totient is φ = 20726784000.

The previous prime is 31223311127. The next prime is 31223311151. The reversal of 31223311131 is 13111332213.

It is a happy number.

It is not a de Polignac number, because 31223311131 - 2² = 31223311127 is a prime.

It is a super-2 number, since 2×31223311131² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31223311098 and 31223311107.

It is not an unprimeable number, because it can be changed into a prime (31223311151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2662581 + ... + 2674281.

It is an arithmetic number, because the mean of its divisors is an integer number (2613044898).

Almost surely, 2^31223311131 is an apocalyptic number.

31223311131 is a deficient number, since it is larger than the sum of its proper divisors (10585407237).

31223311131 is a wasteful number, since it uses less digits than its factorization.

31223311131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15422.

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

Adding to 31223311131 its reverse (13111332213), we get a palindrome (44334643344).

The spelling of 31223311131 in words is "thirty-one billion, two hundred twenty-three million, three hundred eleven thousand, one hundred thirty-one".