64563209 has 2 divisors, whose sum is σ = 64563210. Its totient is φ = 64563208.

The previous prime is 64563203. The next prime is 64563223. The reversal of 64563209 is 90236546.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32809984 + 31753225 = 5728^2 + 5635^2 .

It is a cyclic number.

It is not a de Polignac number, because 64563209 - 2¹² = 64559113 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (64563203) 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, 32281604 + 32281605.

It is an arithmetic number, because the mean of its divisors is an integer number (32281605).

Almost surely, 2^64563209 is an apocalyptic number.

It is an amenable number.

64563209 is a deficient number, since it is larger than the sum of its proper divisors (1).

64563209 is an equidigital number, since it uses as much as digits as its factorization.

64563209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 64563209 is about 8035.1234589146. The cubic root of 64563209 is about 401.1699269247.

The spelling of 64563209 in words is "sixty-four million, five hundred sixty-three thousand, two hundred nine".