131001220 has 96 divisors (see below), whose sum is σ = 329269248. Its totient is φ = 42844032.

The previous prime is 131001217. The next prime is 131001229. The reversal of 131001220 is 22100131.

It is a super-2 number, since 2×131001220² = 34322639282976800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 131001197 and 131001206.

It is not an unprimeable number, because it can be changed into a prime (131001229) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 282709 + ... + 283171.

It is an arithmetic number, because the mean of its divisors is an integer number (3429888).

Almost surely, 2^131001220 is an apocalyptic number.

131001220 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 131001220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (164634624).

131001220 is an abundant number, since it is smaller than the sum of its proper divisors (198268028).

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

131001220 is a wasteful number, since it uses less digits than its factorization.

131001220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 569 (or 567 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 131001220 is about 11445.5764380830. The cubic root of 131001220 is about 507.8768844187.

Adding to 131001220 its reverse (22100131), we get a palindrome (153101351).

The spelling of 131001220 in words is "one hundred thirty-one million, one thousand, two hundred twenty".