131313231220 has 48 divisors (see below), whose sum is σ = 281037714048. Its totient is φ = 51529127040.

The previous prime is 131313231197. The next prime is 131313231221. The reversal of 131313231220 is 22132313131.

It is a junction number, because it is equal to n+sod(n) for n = 131313231191 and 131313231200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131313231221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77451 + ... + 518290.

It is an arithmetic number, because the mean of its divisors is an integer number (5854952376).

Almost surely, 2^131313231220 is an apocalyptic number.

131313231220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131313231220 is an abundant number, since it is smaller than the sum of its proper divisors (149724482828).

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

131313231220 is a wasteful number, since it uses less digits than its factorization.

131313231220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 595960 (or 595958 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 131313231220 its reverse (22132313131), we get a palindrome (153445544351).

The spelling of 131313231220 in words is "one hundred thirty-one billion, three hundred thirteen million, two hundred thirty-one thousand, two hundred twenty".