31312331320 has 64 divisors (see below), whose sum is σ = 71802806400. Its totient is φ = 12285847680.

The previous prime is 31312331317. The next prime is 31312331333. The reversal of 31312331320 is 2313321313.

It is a junction number, because it is equal to n+sod(n) for n = 31312331291 and 31312331300.

It is a congruent number.

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, 1087915 + ... + 1116325.

It is an arithmetic number, because the mean of its divisors is an integer number (1121918850).

Almost surely, 2^31312331320 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 31312331320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35901403200).

31312331320 is an abundant number, since it is smaller than the sum of its proper divisors (40490475080).

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

31312331320 is a wasteful number, since it uses less digits than its factorization.

31312331320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28948 (or 28944 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 22.

Adding to 31312331320 its reverse (2313321313), we get a palindrome (33625652633).

It can be divided in two parts, 313123 and 31320, that added together give a palindrome (344443).

The spelling of 31312331320 in words is "thirty-one billion, three hundred twelve million, three hundred thirty-one thousand, three hundred twenty".