131121224 has 32 divisors (see below), whose sum is σ = 267261120. Its totient is φ = 59946816.

The previous prime is 131121181. The next prime is 131121241. The reversal of 131121224 is 422121131.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5237 + ... + 17019.

It is an arithmetic number, because the mean of its divisors is an integer number (8351910).

Almost surely, 2^131121224 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 131121224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (133630560).

131121224 is an abundant number, since it is smaller than the sum of its proper divisors (136139896).

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

131121224 is a wasteful number, since it uses less digits than its factorization.

131121224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11909 (or 11905 counting only the distinct ones).

The product of its digits is 96, while the sum is 17.

The square root of 131121224 is about 11450.8176127297. The cubic root of 131121224 is about 508.0319177251.

Adding to 131121224 its reverse (422121131), we get a palindrome (553242355).

The spelling of 131121224 in words is "one hundred thirty-one million, one hundred twenty-one thousand, two hundred twenty-four".