31313323132 has 48 divisors (see below), whose sum is σ = 67536667072. Its totient is φ = 12370682880.

The previous prime is 31313323121. The next prime is 31313323133. The reversal of 31313323132 is 23132331313.

It is a junction number, because it is equal to n+sod(n) for n = 31313323097 and 31313323106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31313323133) 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, 208132 + ... + 325492.

Almost surely, 2^31313323132 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31313323132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33768333536).

31313323132 is an abundant number, since it is smaller than the sum of its proper divisors (36223343940).

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

31313323132 is a wasteful number, since it uses less digits than its factorization.

31313323132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118118 (or 118116 counting only the distinct ones).

The product of its digits is 2916, while the sum is 25.

Adding to 31313323132 its reverse (23132331313), we get a palindrome (54445654445).

The spelling of 31313323132 in words is "thirty-one billion, three hundred thirteen million, three hundred twenty-three thousand, one hundred thirty-two".