64397609 has 2 divisors, whose sum is σ = 64397610. Its totient is φ = 64397608.

The previous prime is 64397579. The next prime is 64397611. The reversal of 64397609 is 90679346.

64397609 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56851600 + 7546009 = 7540^2 + 2747^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64397609 is a prime.

Together with 64397611, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64397609.

It is not a weakly prime, because it can be changed into another prime (64397659) 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, 32198804 + 32198805.

It is an arithmetic number, because the mean of its divisors is an integer number (32198805).

Almost surely, 2^64397609 is an apocalyptic number.

It is an amenable number.

64397609 is a deficient number, since it is larger than the sum of its proper divisors (1).

64397609 is an equidigital number, since it uses as much as digits as its factorization.

64397609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 244944, while the sum is 44.

The square root of 64397609 is about 8024.8120850273. The cubic root of 64397609 is about 400.8266425617.

The spelling of 64397609 in words is "sixty-four million, three hundred ninety-seven thousand, six hundred nine".