64535509 has 2 divisors, whose sum is σ = 64535510. Its totient is φ = 64535508.

The previous prime is 64535507. The next prime is 64535563. The reversal of 64535509 is 90553546.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59629284 + 4906225 = 7722^2 + 2215^2 .

It is a cyclic number.

It is not a de Polignac number, because 64535509 - 2¹ = 64535507 is a prime.

Together with 64535507, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64535507) 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, 32267754 + 32267755.

It is an arithmetic number, because the mean of its divisors is an integer number (32267755).

Almost surely, 2^64535509 is an apocalyptic number.

It is an amenable number.

64535509 is a deficient number, since it is larger than the sum of its proper divisors (1).

64535509 is an equidigital number, since it uses as much as digits as its factorization.

64535509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81000, while the sum is 37.

The square root of 64535509 is about 8033.3995917046. The cubic root of 64535509 is about 401.1125464819.

The spelling of 64535509 in words is "sixty-four million, five hundred thirty-five thousand, five hundred nine".