1331320032 has 72 divisors (see below), whose sum is σ = 4326796656. Its totient is φ = 380376576.

The previous prime is 1331320021. The next prime is 1331320037. The reversal of 1331320032 is 2300231331.

It is a tau number, because it is divible by the number of its divisors (72).

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

It is a junction number, because it is equal to n+sod(n) for n = 1331319987 and 1331320014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331320037) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 328173 + ... + 332204.

It is an arithmetic number, because the mean of its divisors is an integer number (60094398).

Almost surely, 2^1331320032 is an apocalyptic number.

1331320032 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1331320032 is an abundant number, since it is smaller than the sum of its proper divisors (2995476624).

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

1331320032 is a wasteful number, since it uses less digits than its factorization.

1331320032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660400 (or 660389 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 18.

The square root of 1331320032 is about 36487.2584884093. The cubic root of 1331320032 is about 1100.0881560202.

Adding to 1331320032 its reverse (2300231331), we get a palindrome (3631551363).

The spelling of 1331320032 in words is "one billion, three hundred thirty-one million, three hundred twenty thousand, thirty-two".