64601809 has 2 divisors, whose sum is σ = 64601810. Its totient is φ = 64601808.

The previous prime is 64601791. The next prime is 64601851. The reversal of 64601809 is 90810646.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33965584 + 30636225 = 5828^2 + 5535^2 .

It is a cyclic number.

It is not a de Polignac number, because 64601809 - 2¹⁵ = 64569041 is a prime.

It is not a weakly prime, because it can be changed into another prime (64602809) 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, 32300904 + 32300905.

It is an arithmetic number, because the mean of its divisors is an integer number (32300905).

Almost surely, 2^64601809 is an apocalyptic number.

It is an amenable number.

64601809 is a deficient number, since it is larger than the sum of its proper divisors (1).

64601809 is an equidigital number, since it uses as much as digits as its factorization.

64601809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 64601809 is about 8037.5250543933. The cubic root of 64601809 is about 401.2498593116.

The spelling of 64601809 in words is "sixty-four million, six hundred one thousand, eight hundred nine".