1331132321 has 4 divisors (see below), whose sum is σ = 1331312832. Its totient is φ = 1330951812.

The previous prime is 1331132303. The next prime is 1331132333. The reversal of 1331132321 is 1232311331.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1232311331 = 283 ⋅4354457.

It is a cyclic number.

It is not a de Polignac number, because 1331132321 - 2¹⁴ = 1331115937 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1331132293 and 1331132302.

It is not an unprimeable number, because it can be changed into a prime (1331132371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78701 + ... + 94106.

It is an arithmetic number, because the mean of its divisors is an integer number (332828208).

Almost surely, 2^1331132321 is an apocalyptic number.

It is an amenable number.

1331132321 is a deficient number, since it is larger than the sum of its proper divisors (180511).

1331132321 is an equidigital number, since it uses as much as digits as its factorization.

1331132321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180510.

The product of its digits is 324, while the sum is 20.

The square root of 1331132321 is about 36484.6861162324. The cubic root of 1331132321 is about 1100.0364508582.

Adding to 1331132321 its reverse (1232311331), we get a palindrome (2563443652).

The spelling of 1331132321 in words is "one billion, three hundred thirty-one million, one hundred thirty-two thousand, three hundred twenty-one".