131331224 has 8 divisors (see below), whose sum is σ = 246246060. Its totient is φ = 65665608.

The previous prime is 131331203. The next prime is 131331229. The reversal of 131331224 is 422133131.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 131331196 and 131331205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131331229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8208194 + ... + 8208209.

Almost surely, 2^131331224 is an apocalyptic number.

It is an amenable number.

131331224 is a deficient number, since it is larger than the sum of its proper divisors (114914836).

131331224 is a wasteful number, since it uses less digits than its factorization.

131331224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16416409 (or 16416405 counting only the distinct ones).

The product of its digits is 432, while the sum is 20.

The square root of 131331224 is about 11459.9835951017. The cubic root of 131331224 is about 508.3029895232.

Adding to 131331224 its reverse (422133131), we get a palindrome (553464355).

The spelling of 131331224 in words is "one hundred thirty-one million, three hundred thirty-one thousand, two hundred twenty-four".