6531301631220 has 192 divisors, whose sum is σ = 19395342618624. Its totient is φ = 1638772495360.

The previous prime is 6531301631213. The next prime is 6531301631279. The reversal of 6531301631220 is 221361031356.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 43329904 + ... + 43480376.

It is an arithmetic number, because the mean of its divisors is an integer number (101017409472).

Almost surely, 2^{6531301631220} is an apocalyptic number.

6531301631220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6531301631220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9697671309312).

6531301631220 is an abundant number, since it is smaller than the sum of its proper divisors (12864040987404).

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

6531301631220 is a wasteful number, since it uses less digits than its factorization.

6531301631220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151022 (or 151020 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 33.

Adding to 6531301631220 its reverse (221361031356), we get a palindrome (6752662662576).

The spelling of 6531301631220 in words is "six trillion, five hundred thirty-one billion, three hundred one million, six hundred thirty-one thousand, two hundred twenty".