64043561 has 2 divisors, whose sum is σ = 64043562. Its totient is φ = 64043560.

The previous prime is 64043537. The next prime is 64043587. The reversal of 64043561 is 16534046.

It is a happy number.

64043561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41538025 + 22505536 = 6445^2 + 4744^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64043561 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 (64043501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32021780 + 32021781.

It is an arithmetic number, because the mean of its divisors is an integer number (32021781).

Almost surely, 2^64043561 is an apocalyptic number.

It is an amenable number.

64043561 is a deficient number, since it is larger than the sum of its proper divisors (1).

64043561 is an equidigital number, since it uses as much as digits as its factorization.

64043561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 64043561 is about 8002.7220993859. The cubic root of 64043561 is about 400.0907315013.

The spelling of 64043561 in words is "sixty-four million, forty-three thousand, five hundred sixty-one".