331601321 has 2 divisors, whose sum is σ = 331601322. Its totient is φ = 331601320.

The previous prime is 331601297. The next prime is 331601329. The reversal of 331601321 is 123106133.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 272910400 + 58690921 = 16520^2 + 7661^2 .

It is an emirp because it is prime and its reverse (123106133) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-331601321 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 331601293 and 331601302.

It is not a weakly prime, because it can be changed into another prime (331601329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165800660 + 165800661.

It is an arithmetic number, because the mean of its divisors is an integer number (165800661).

Almost surely, 2^331601321 is an apocalyptic number.

It is an amenable number.

331601321 is a deficient number, since it is larger than the sum of its proper divisors (1).

331601321 is an equidigital number, since it uses as much as digits as its factorization.

331601321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 331601321 is about 18209.9236956117. The cubic root of 331601321 is about 692.1582780554.

Adding to 331601321 its reverse (123106133), we get a palindrome (454707454).

The spelling of 331601321 in words is "three hundred thirty-one million, six hundred one thousand, three hundred twenty-one".