320332321 has 4 divisors (see below), whose sum is σ = 321240132. Its totient is φ = 319424512.

The previous prime is 320332319. The next prime is 320332349. The reversal of 320332321 is 123233023.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 123233023 = 2797 ⋅44059.

It can be written as a sum of positive squares in 2 ways, for example, as 71166096 + 249166225 = 8436^2 + 15785^2 .

It is a cyclic number.

It is not a de Polignac number, because 320332321 - 2¹ = 320332319 is a prime.

It is a super-2 number, since 2×320332321² = 205225591754494082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320332351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 453376 + ... + 454081.

It is an arithmetic number, because the mean of its divisors is an integer number (80310033).

Almost surely, 2^320332321 is an apocalyptic number.

It is an amenable number.

320332321 is a deficient number, since it is larger than the sum of its proper divisors (907811).

320332321 is an equidigital number, since it uses as much as digits as its factorization.

320332321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 907810.

The product of its (nonzero) digits is 648, while the sum is 19.

The square root of 320332321 is about 17897.8300640050. The cubic root of 320332321 is about 684.2270721359.

Adding to 320332321 its reverse (123233023), we get a palindrome (443565344).

The spelling of 320332321 in words is "three hundred twenty million, three hundred thirty-two thousand, three hundred twenty-one".