64609 has 2 divisors, whose sum is σ = 64610. Its totient is φ = 64608.

The previous prime is 64601. The next prime is 64613. The reversal of 64609 is 90646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61009 + 3600 = 247^2 + 60^2 .

It is a cyclic number.

It is not a de Polignac number, because 64609 - 2³ = 64601 is a prime.

64609 is a lucky number.

It is a nialpdrome in base 16.

It is not a weakly prime, because it can be changed into another prime (64601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32304 + 32305.

It is an arithmetic number, because the mean of its divisors is an integer number (32305).

2⁶⁴⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

64609 is a deficient number, since it is larger than the sum of its proper divisors (1).

64609 is an equidigital number, since it uses as much as digits as its factorization.

64609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 64609 is about 254.1830049394. The cubic root of 64609 is about 40.1264746824.

The spelling of 64609 in words is "sixty-four thousand, six hundred nine".