31000303120 has 80 divisors (see below), whose sum is σ = 72647136000. Its totient is φ = 12302065152.

The previous prime is 31000303109. The next prime is 31000303163. The reversal of 31000303120 is 2130300013.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×31000303120² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31000303120.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10335381 + ... + 10338379.

It is an arithmetic number, because the mean of its divisors is an integer number (908089200).

Almost surely, 2^31000303120 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 31000303120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36323568000).

31000303120 is an abundant number, since it is smaller than the sum of its proper divisors (41646832880).

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

31000303120 is a wasteful number, since it uses less digits than its factorization.

31000303120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3992 (or 3986 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 13.

Adding to 31000303120 its reverse (2130300013), we get a palindrome (33130603133).

The spelling of 31000303120 in words is "thirty-one billion, three hundred three thousand, one hundred twenty".