131224220 has 24 divisors (see below), whose sum is σ = 276366384. Its totient is φ = 52338176.

The previous prime is 131224213. The next prime is 131224229. The reversal of 131224220 is 22422131.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131224229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2234 + ... + 16353.

It is an arithmetic number, because the mean of its divisors is an integer number (11515266).

Almost surely, 2^131224220 is an apocalyptic number.

131224220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131224220 is an abundant number, since it is smaller than the sum of its proper divisors (145142164).

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

131224220 is a wasteful number, since it uses less digits than its factorization.

131224220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18949 (or 18947 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 131224220 is about 11455.3140506928. The cubic root of 131224220 is about 508.1649029613.

Adding to 131224220 its reverse (22422131), we get a palindrome (153646351).

The spelling of 131224220 in words is "one hundred thirty-one million, two hundred twenty-four thousand, two hundred twenty".