1331446321 has 4 divisors (see below), whose sum is σ = 1331873892. Its totient is φ = 1331018752.

The previous prime is 1331446313. The next prime is 1331446327. The reversal of 1331446321 is 1236441331.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 678081600 + 653364721 = 26040^2 + 25561^2 .

It is a cyclic number.

It is not a de Polignac number, because 1331446321 - 2³ = 1331446313 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1331446321.

It is not an unprimeable number, because it can be changed into a prime (1331446327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 209080 + ... + 215353.

It is an arithmetic number, because the mean of its divisors is an integer number (332968473).

Almost surely, 2^1331446321 is an apocalyptic number.

It is an amenable number.

1331446321 is a deficient number, since it is larger than the sum of its proper divisors (427571).

1331446321 is an equidigital number, since it uses as much as digits as its factorization.

1331446321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427570.

The product of its digits is 5184, while the sum is 28.

The square root of 1331446321 is about 36488.9890377906. The cubic root of 1331446321 is about 1100.1229397029.

Adding to 1331446321 its reverse (1236441331), we get a palindrome (2567887652).

The spelling of 1331446321 in words is "one billion, three hundred thirty-one million, four hundred forty-six thousand, three hundred twenty-one".