64344521 has 2 divisors, whose sum is σ = 64344522. Its totient is φ = 64344520.

The previous prime is 64344481. The next prime is 64344523. The reversal of 64344521 is 12544346.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52345225 + 11999296 = 7235^2 + 3464^2 .

It is a cyclic number.

It is not a de Polignac number, because 64344521 - 2¹⁰ = 64343497 is a prime.

Together with 64344523, 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 (64344523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32172260 + 32172261.

It is an arithmetic number, because the mean of its divisors is an integer number (32172261).

Almost surely, 2^64344521 is an apocalyptic number.

It is an amenable number.

64344521 is a deficient number, since it is larger than the sum of its proper divisors (1).

64344521 is an equidigital number, since it uses as much as digits as its factorization.

64344521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11520, while the sum is 29.

The square root of 64344521 is about 8021.5036620324. The cubic root of 64344521 is about 400.7164680011.

Adding to 64344521 its reverse (12544346), we get a palindrome (76888867).

The spelling of 64344521 in words is "sixty-four million, three hundred forty-four thousand, five hundred twenty-one".