131231224 has 16 divisors (see below), whose sum is σ = 249430320. Its totient is φ = 64716480.

The previous prime is 131231213. The next prime is 131231237. The reversal of 131231224 is 422132131.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111772 + ... + 112939.

It is an arithmetic number, because the mean of its divisors is an integer number (15589395).

Almost surely, 2^131231224 is an apocalyptic number.

It is an amenable number.

131231224 is a deficient number, since it is larger than the sum of its proper divisors (118199096).

131231224 is a wasteful number, since it uses less digits than its factorization.

131231224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224790 (or 224786 counting only the distinct ones).

The product of its digits is 288, while the sum is 19.

The square root of 131231224 is about 11455.6197562594. The cubic root of 131231224 is about 508.1739437813.

Adding to 131231224 its reverse (422132131), we get a palindrome (553363355).

The spelling of 131231224 in words is "one hundred thirty-one million, two hundred thirty-one thousand, two hundred twenty-four".