331322321 has 6 divisors (see below), whose sum is σ = 364180866. Its totient is φ = 301202000.

The previous prime is 331322297. The next prime is 331322339. The reversal of 331322321 is 123223133.

It can be written as a sum of positive squares in only one way, i.e., 249166225 + 82156096 = 15785^2 + 9064^2 .

It is not a de Polignac number, because 331322321 - 2¹⁴ = 331305937 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 331322293 and 331322302.

It is not an unprimeable number, because it can be changed into a prime (331322821) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1368980 + ... + 1369221.

It is an arithmetic number, because the mean of its divisors is an integer number (60696811).

Almost surely, 2^331322321 is an apocalyptic number.

It is an amenable number.

331322321 is a deficient number, since it is larger than the sum of its proper divisors (32858545).

331322321 is a wasteful number, since it uses less digits than its factorization.

331322321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2738223 (or 2738212 counting only the distinct ones).

The product of its digits is 648, while the sum is 20.

The square root of 331322321 is about 18202.2614254383. The cubic root of 331322321 is about 691.9641027688.

Adding to 331322321 its reverse (123223133), we get a palindrome (454545454).

It can be divided in two parts, 33132 and 2321, that added together give a palindrome (35453).

The spelling of 331322321 in words is "three hundred thirty-one million, three hundred twenty-two thousand, three hundred twenty-one".