64343621 has 2 divisors, whose sum is σ = 64343622. Its totient is φ = 64343620.

The previous prime is 64343603. The next prime is 64343639. The reversal of 64343621 is 12634346.

It is a balanced prime because it is at equal distance from previous prime (64343603) and next prime (64343639).

It can be written as a sum of positive squares in only one way, i.e., 59459521 + 4884100 = 7711^2 + 2210^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64343621 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64343641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32171810 + 32171811.

It is an arithmetic number, because the mean of its divisors is an integer number (32171811).

Almost surely, 2^64343621 is an apocalyptic number.

It is an amenable number.

64343621 is a deficient number, since it is larger than the sum of its proper divisors (1).

64343621 is an equidigital number, since it uses as much as digits as its factorization.

64343621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 29.

The square root of 64343621 is about 8021.4475626286. The cubic root of 64343621 is about 400.7145996913.

Adding to 64343621 its reverse (12634346), we get a palindrome (76977967).

The spelling of 64343621 in words is "sixty-four million, three hundred forty-three thousand, six hundred twenty-one".