131222120 has 64 divisors (see below), whose sum is σ = 303851520. Its totient is φ = 50978304.

The previous prime is 131222093. The next prime is 131222123. The reversal of 131222120 is 21222131.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 131222095 and 131222104.

It is not an unprimeable number, because it can be changed into a prime (131222123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 419084 + ... + 419396.

It is an arithmetic number, because the mean of its divisors is an integer number (4747680).

Almost surely, 2^131222120 is an apocalyptic number.

131222120 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 131222120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (151925760).

131222120 is an abundant number, since it is smaller than the sum of its proper divisors (172629400).

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

131222120 is a wasteful number, since it uses less digits than its factorization.

131222120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 594 (or 590 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 131222120 is about 11455.2223898098. Note that the first 3 decimals coincide. The cubic root of 131222120 is about 508.1621922016.

Adding to 131222120 its reverse (21222131), we get a palindrome (152444251).

It can be divided in two parts, 1312 and 22120, that added together give a palindrome (23432).

The spelling of 131222120 in words is "one hundred thirty-one million, two hundred twenty-two thousand, one hundred twenty".