131223232 has 28 divisors (see below), whose sum is σ = 297596560. Its totient is φ = 56238336.

The previous prime is 131223227. The next prime is 131223233. The reversal of 131223232 is 232322131.

It is a tau number, because it is divible by the number of its divisors (28).

It is not an unprimeable number, because it can be changed into a prime (131223233) 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 3 ways as a sum of consecutive naturals, for example, 146007 + ... + 146902.

Almost surely, 2^131223232 is an apocalyptic number.

It is an amenable number.

131223232 is an abundant number, since it is smaller than the sum of its proper divisors (166373328).

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

131223232 is an equidigital number, since it uses as much as digits as its factorization.

131223232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292928 (or 292918 counting only the distinct ones).

The product of its digits is 432, while the sum is 19.

The square root of 131223232 is about 11455.2709265211. The cubic root of 131223232 is about 508.1636276170.

Adding to 131223232 its reverse (232322131), we get a palindrome (363545363).

The spelling of 131223232 in words is "one hundred thirty-one million, two hundred twenty-three thousand, two hundred thirty-two".