64409321 has 2 divisors, whose sum is σ = 64409322. Its totient is φ = 64409320.

The previous prime is 64409309. The next prime is 64409327. The reversal of 64409321 is 12390446.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54922921 + 9486400 = 7411^2 + 3080^2 .

It is a cyclic number.

It is not a de Polignac number, because 64409321 - 2¹⁸ = 64147177 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (64409327) 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, 32204660 + 32204661.

It is an arithmetic number, because the mean of its divisors is an integer number (32204661).

Almost surely, 2^64409321 is an apocalyptic number.

It is an amenable number.

64409321 is a deficient number, since it is larger than the sum of its proper divisors (1).

64409321 is an equidigital number, since it uses as much as digits as its factorization.

64409321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 64409321 is about 8025.5417885648. The cubic root of 64409321 is about 400.8509405501.

Adding to 64409321 its reverse (12390446), we get a palindrome (76799767).

The spelling of 64409321 in words is "sixty-four million, four hundred nine thousand, three hundred twenty-one".