31131320000 has 140 divisors (see below), whose sum is σ = 84214523976. Its totient is φ = 11320320000.

The previous prime is 31131319993. The next prime is 31131320021. The reversal of 31131320000 is 2313113.

It is an unprimeable number.

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 19 ways as a sum of consecutive naturals, for example, 404624 + ... + 475376.

Almost surely, 2^31131320000 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 31131320000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42107261988).

31131320000 is an abundant number, since it is smaller than the sum of its proper divisors (53083203976).

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

31131320000 is an equidigital number, since it uses as much as digits as its factorization.

31131320000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70796 (or 70771 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 14.

Adding to 31131320000 its reverse (2313113), we get a palindrome (31133633113).

The spelling of 31131320000 in words is "thirty-one billion, one hundred thirty-one million, three hundred twenty thousand".