324640681 has 2 divisors, whose sum is σ = 324640682. Its totient is φ = 324640680.

The previous prime is 324640643. The next prime is 324640733. The reversal of 324640681 is 186046423.

324640681 = 12740² + 12741².

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 162333081 + 162307600 = 12741^2 + 12740^2 .

It is a cyclic number.

It is not a de Polignac number, because 324640681 - 2²³ = 316252073 is a prime.

It is a super-2 number, since 2×324640681² = 210783143520287522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (324640621) 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, 162320340 + 162320341.

It is an arithmetic number, because the mean of its divisors is an integer number (162320341).

Almost surely, 2^324640681 is an apocalyptic number.

324640681 is the 12741-st centered square number.

It is an amenable number.

324640681 is a deficient number, since it is larger than the sum of its proper divisors (1).

324640681 is an equidigital number, since it uses as much as digits as its factorization.

324640681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27648, while the sum is 34.

The square root of 324640681 is about 18017.7879052896. The cubic root of 324640681 is about 687.2809614500.

The spelling of 324640681 in words is "three hundred twenty-four million, six hundred forty thousand, six hundred eighty-one".