6464509 has 2 divisors, whose sum is σ = 6464510. Its totient is φ = 6464508.

The previous prime is 6464501. The next prime is 6464519. The reversal of 6464509 is 9054646.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6100900 + 363609 = 2470^2 + 603^2 .

It is a cyclic number.

It is not a de Polignac number, because 6464509 - 2³ = 6464501 is a prime.

It is a super-2 number, since 2×6464509² = 83579753222162, which contains 22 as substring.

6464509 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6464501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3232254 + 3232255.

It is an arithmetic number, because the mean of its divisors is an integer number (3232255).

Almost surely, 2^6464509 is an apocalyptic number.

It is an amenable number.

6464509 is a deficient number, since it is larger than the sum of its proper divisors (1).

6464509 is an equidigital number, since it uses as much as digits as its factorization.

6464509 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 6464509 is about 2542.5398718604. The cubic root of 6464509 is about 186.2852696596.

The spelling of 6464509 in words is "six million, four hundred sixty-four thousand, five hundred nine".