8649509 has 4 divisors (see below), whose sum is σ = 9435840. Its totient is φ = 7863180.

The previous prime is 8649491. The next prime is 8649517. The reversal of 8649509 is 9059468.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8649509 - 2⁸ = 8649253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8649409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 393149 + ... + 393170.

It is an arithmetic number, because the mean of its divisors is an integer number (2358960).

Almost surely, 2^8649509 is an apocalyptic number.

It is an amenable number.

8649509 is a deficient number, since it is larger than the sum of its proper divisors (786331).

8649509 is a wasteful number, since it uses less digits than its factorization.

8649509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 786330.

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 8649509 is about 2941.0047602818. The cubic root of 8649509 is about 205.2723645259.

Subtracting from 8649509 its sum of digits (41), we obtain a palindrome (8649468).

The spelling of 8649509 in words is "eight million, six hundred forty-nine thousand, five hundred nine".