320016321 has 27 divisors (see below), whose sum is σ = 474579651. Its totient is φ = 207798624.

The previous prime is 320016299. The next prime is 320016329. The reversal of 320016321 is 123610023.

The square root of 320016321 is 17889.

It is a perfect power (a square), and thus also a powerful number.

320016321 is a `hidden beast` number, since 32 + 0 + 0 + 1 + 632 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 61449921 + 258566400 = 7839^2 + 16080^2 .

It is not a de Polignac number, because 320016321 - 2¹⁵ = 319983553 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 320016294 and 320016303.

It is not an unprimeable number, because it can be changed into a prime (320016329) 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 26 ways as a sum of consecutive naturals, for example, 3595645 + ... + 3595733.

Almost surely, 2^320016321 is an apocalyptic number.

320016321 is the 17889-th square number.

320016321 is the 8945-th centered octagonal number.

It is an amenable number.

320016321 is a deficient number, since it is larger than the sum of its proper divisors (154563330).

320016321 is an frugal number, since it uses more digits than its factorization.

320016321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318 (or 159 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The cubic root of 320016321 is about 684.0020070219.

Adding to 320016321 its reverse (123610023), we get a palindrome (443626344).

The spelling of 320016321 in words is "three hundred twenty million, sixteen thousand, three hundred twenty-one".