1331230321 has 4 divisors (see below), whose sum is σ = 1333288512. Its totient is φ = 1329172132.

The previous prime is 1331230301. The next prime is 1331230337. The reversal of 1331230321 is 1230321331.

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.

It is a cyclic number.

It is not a de Polignac number, because 1331230321 - 2¹¹ = 1331228273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1331230301) 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, 1028125 + ... + 1029418.

It is an arithmetic number, because the mean of its divisors is an integer number (333322128).

Almost surely, 2^1331230321 is an apocalyptic number.

It is an amenable number.

1331230321 is a deficient number, since it is larger than the sum of its proper divisors (2058191).

1331230321 is an equidigital number, since it uses as much as digits as its factorization.

1331230321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2058190.

The product of its (nonzero) digits is 324, while the sum is 19.

The square root of 1331230321 is about 36486.0291207470. The cubic root of 1331230321 is about 1100.0634456518.

Adding to 1331230321 its reverse (1230321331), we get a palindrome (2561551652).

The spelling of 1331230321 in words is "one billion, three hundred thirty-one million, two hundred thirty thousand, three hundred twenty-one".