131031231320 has 64 divisors (see below), whose sum is σ = 322026516000. Its totient is φ = 47587809280.

The previous prime is 131031231319. The next prime is 131031231323. The reversal of 131031231320 is 23132130131.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 131031231292 and 131031231301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131031231323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 163856 + ... + 537504.

Almost surely, 2^131031231320 is an apocalyptic number.

131031231320 is a gapful number since it is divisible by the number (10) 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 131031231320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (161013258000).

131031231320 is an abundant number, since it is smaller than the sum of its proper divisors (190995284680).

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

131031231320 is a wasteful number, since it uses less digits than its factorization.

131031231320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374468 (or 374464 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 131031231320 its reverse (23132130131), we get a palindrome (154163361451).

The spelling of 131031231320 in words is "one hundred thirty-one billion, thirty-one million, two hundred thirty-one thousand, three hundred twenty".