31201131320 has 64 divisors (see below), whose sum is σ = 72792216000. Its totient is φ = 12022069248.

The previous prime is 31201131319. The next prime is 31201131343. The reversal of 31201131320 is 2313110213.

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, 471221 + ... + 533339.

It is an arithmetic number, because the mean of its divisors is an integer number (1137378375).

Almost surely, 2^31201131320 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 31201131320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36396108000).

31201131320 is an abundant number, since it is smaller than the sum of its proper divisors (41591084680).

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

31201131320 is a wasteful number, since it uses less digits than its factorization.

31201131320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62592 (or 62588 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 31201131320 its reverse (2313110213), we get a palindrome (33514241533).

The spelling of 31201131320 in words is "thirty-one billion, two hundred one million, one hundred thirty-one thousand, three hundred twenty".