64520609 has 2 divisors, whose sum is σ = 64520610. Its totient is φ = 64520608.

The previous prime is 64520591. The next prime is 64520623. The reversal of 64520609 is 90602546.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63760225 + 760384 = 7985^2 + 872^2 .

It is a cyclic number.

It is not a de Polignac number, because 64520609 - 2⁸ = 64520353 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64520629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32260304 + 32260305.

It is an arithmetic number, because the mean of its divisors is an integer number (32260305).

Almost surely, 2^64520609 is an apocalyptic number.

It is an amenable number.

64520609 is a deficient number, since it is larger than the sum of its proper divisors (1).

64520609 is an equidigital number, since it uses as much as digits as its factorization.

64520609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 64520609 is about 8032.4721599269. The cubic root of 64520609 is about 401.0816743980.

The spelling of 64520609 in words is "sixty-four million, five hundred twenty thousand, six hundred nine".