321331481 has 2 divisors, whose sum is σ = 321331482. Its totient is φ = 321331480.

The previous prime is 321331471. The next prime is 321331487. The reversal of 321331481 is 184133123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 239971081 + 81360400 = 15491^2 + 9020^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321331481 is a prime.

It is a super-2 number, since 2×321331481² = 206507841363306722, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 321331481.

It is not a weakly prime, because it can be changed into another prime (321331487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160665740 + 160665741.

It is an arithmetic number, because the mean of its divisors is an integer number (160665741).

Almost surely, 2^321331481 is an apocalyptic number.

It is an amenable number.

321331481 is a deficient number, since it is larger than the sum of its proper divisors (1).

321331481 is an equidigital number, since it uses as much as digits as its factorization.

321331481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 26.

The square root of 321331481 is about 17925.7212128271. The cubic root of 321331481 is about 684.9377328095.

The spelling of 321331481 in words is "three hundred twenty-one million, three hundred thirty-one thousand, four hundred eighty-one".