31131310122 has 80 divisors (see below), whose sum is σ = 76150476864. Its totient is φ = 9427320000.

The previous prime is 31131310117. The next prime is 31131310193. The reversal of 31131310122 is 22101313113.

31131310122 is a `hidden beast` number, since 311 + 31 + 310 + 12 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 31131310095 and 31131310104.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 3061747 + ... + 3071897.

Almost surely, 2^31131310122 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31131310122, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38075238432).

31131310122 is an abundant number, since it is smaller than the sum of its proper divisors (45019166742).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31131310122 is a wasteful number, since it uses less digits than its factorization.

31131310122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11897 (or 11888 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 31131310122 its reverse (22101313113), we get a palindrome (53232623235).

The spelling of 31131310122 in words is "thirty-one billion, one hundred thirty-one million, three hundred ten thousand, one hundred twenty-two".