131031101220 has 24 divisors (see below), whose sum is σ = 366887083584. Its totient is φ = 34941626976.

The previous prime is 131031101209. The next prime is 131031101221. The reversal of 131031101220 is 22101130131.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 131031101220.

It is not an unprimeable number, because it can be changed into a prime (131031101221) 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 7 ways as a sum of consecutive naturals, for example, 1091925784 + ... + 1091925903.

It is an arithmetic number, because the mean of its divisors is an integer number (15286961816).

Almost surely, 2^131031101220 is an apocalyptic number.

131031101220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131031101220 is an abundant number, since it is smaller than the sum of its proper divisors (235855982364).

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

131031101220 is a wasteful number, since it uses less digits than its factorization.

131031101220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2183851699 (or 2183851697 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 131031101220 its reverse (22101130131), we get a palindrome (153132231351).

The spelling of 131031101220 in words is "one hundred thirty-one billion, thirty-one million, one hundred one thousand, two hundred twenty".