64613321 has 2 divisors, whose sum is σ = 64613322. Its totient is φ = 64613320.

The previous prime is 64613317. The next prime is 64613323. The reversal of 64613321 is 12331646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54760000 + 9853321 = 7400^2 + 3139^2 .

It is a cyclic number.

It is not a de Polignac number, because 64613321 - 2² = 64613317 is a prime.

Together with 64613323, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64613323) 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, 32306660 + 32306661.

It is an arithmetic number, because the mean of its divisors is an integer number (32306661).

Almost surely, 2^64613321 is an apocalyptic number.

It is an amenable number.

64613321 is a deficient number, since it is larger than the sum of its proper divisors (1).

64613321 is an equidigital number, since it uses as much as digits as its factorization.

64613321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 26.

The square root of 64613321 is about 8038.2411633392. The cubic root of 64613321 is about 401.2736920499.

Adding to 64613321 its reverse (12331646), we get a palindrome (76944967).

The spelling of 64613321 in words is "sixty-four million, six hundred thirteen thousand, three hundred twenty-one".