It is a happy number.
It is a tau number, because it is divible by the number of its divisors (54).
It is a nialpdrome in base 9.
It is a zygodrome in base 9.
It is a congruent number.
131220 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
2131220 is an apocalyptic number.
131220 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 131220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (206661).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
131220 is an frugal number, since it uses more digits than its factorization.
131220 is an evil number, because the sum of its binary digits is even.
The square root of 131220 is about 362.2430123550. The cubic root of 131220 is about 50.8159455596.
Adding to 131220 its reverse (22131), we get a palindrome (153351).
The spelling of 131220 in words is "one hundred thirty-one thousand, two hundred twenty".