331324561 has 2 divisors, whose sum is σ = 331324562. Its totient is φ = 331324560.

The previous prime is 331324481. The next prime is 331324601. The reversal of 331324561 is 165423133.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 261016336 + 70308225 = 16156^2 + 8385^2 .

It is a cyclic number.

It is not a de Polignac number, because 331324561 - 2²³ = 322935953 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (331324061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165662280 + 165662281.

It is an arithmetic number, because the mean of its divisors is an integer number (165662281).

Almost surely, 2^331324561 is an apocalyptic number.

It is an amenable number.

331324561 is a deficient number, since it is larger than the sum of its proper divisors (1).

331324561 is an equidigital number, since it uses as much as digits as its factorization.

331324561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 28.

The square root of 331324561 is about 18202.3229561504. The cubic root of 331324561 is about 691.9656621729.

Adding to 331324561 its reverse (165423133), we get a palindrome (496747694).

The spelling of 331324561 in words is "three hundred thirty-one million, three hundred twenty-four thousand, five hundred sixty-one".