64564009 has 2 divisors, whose sum is σ = 64564010. Its totient is φ = 64564008.

The previous prime is 64563997. The next prime is 64564039. The reversal of 64564009 is 90046546.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42614784 + 21949225 = 6528^2 + 4685^2 .

It is a cyclic number.

It is not a de Polignac number, because 64564009 - 2¹⁷ = 64432937 is a prime.

It is a super-2 number, since 2×64564009² = 8337022516304162, which contains 22 as substring.

It is equal to p_3816439 and since 64564009 and 3816439 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (64564039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32282004 + 32282005.

It is an arithmetic number, because the mean of its divisors is an integer number (32282005).

Almost surely, 2^64564009 is an apocalyptic number.

It is an amenable number.

64564009 is a deficient number, since it is larger than the sum of its proper divisors (1).

64564009 is an equidigital number, since it uses as much as digits as its factorization.

64564009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 64564009 is about 8035.1732401984. The cubic root of 64564009 is about 401.1715838778.

The spelling of 64564009 in words is "sixty-four million, five hundred sixty-four thousand, nine".