1331231232 has 80 divisors (see below), whose sum is σ = 3554147520. Its totient is φ = 442785792.

The previous prime is 1331231197. The next prime is 1331231261. The reversal of 1331231232 is 2321321331.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 1331231199 and 1331231208.

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, 1288188 + ... + 1289220.

It is an arithmetic number, because the mean of its divisors is an integer number (44426844).

Almost surely, 2^1331231232 is an apocalyptic number.

1331231232 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 1331231232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1777073760).

1331231232 is an abundant number, since it is smaller than the sum of its proper divisors (2222916288).

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

1331231232 is an equidigital number, since it uses as much as digits as its factorization.

1331231232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1893 (or 1877 counting only the distinct ones).

The product of its digits is 648, while the sum is 21.

The square root of 1331231232 is about 36486.0416049755. The cubic root of 1331231232 is about 1100.0636965870.

Adding to 1331231232 its reverse (2321321331), we get a palindrome (3652552563).

Subtracting 1331231232 from its reverse (2321321331), we obtain a palindrome (990090099).

It can be divided in two parts, 13312 and 31232, that added together give a palindrome (44544).

The spelling of 1331231232 in words is "one billion, three hundred thirty-one million, two hundred thirty-one thousand, two hundred thirty-two".