131231232 has 160 divisors (see below), whose sum is σ = 424258560. Its totient is φ = 39720960.

The previous prime is 131231213. The next prime is 131231237. The reversal of 131231232 is 232132131.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits and also a Zuckerman number because it is divisible by the product of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131231237) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 151633 + ... + 152495.

It is an arithmetic number, because the mean of its divisors is an integer number (2651616).

Almost surely, 2^131231232 is an apocalyptic number.

131231232 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 131231232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (212129280).

131231232 is an abundant number, since it is smaller than the sum of its proper divisors (293027328).

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

131231232 is an equidigital number, since it uses as much as digits as its factorization.

131231232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 901 (or 879 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 131231232 is about 11455.6201054330. The cubic root of 131231232 is about 508.1739541076.

Adding to 131231232 its reverse (232132131), we get a palindrome (363363363).

The spelling of 131231232 in words is "one hundred thirty-one million, two hundred thirty-one thousand, two hundred thirty-two".