8009509 has 4 divisors (see below), whose sum is σ = 8072704. Its totient is φ = 7946316.

The previous prime is 8009467. The next prime is 8009513. The reversal of 8009509 is 9059008.

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 a de Polignac number, because none of the positive numbers 2^k-8009509 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 (8009549) 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, 31407 + ... + 31660.

It is an arithmetic number, because the mean of its divisors is an integer number (2018176).

Almost surely, 2^8009509 is an apocalyptic number.

It is an amenable number.

8009509 is a deficient number, since it is larger than the sum of its proper divisors (63195).

8009509 is a wasteful number, since it uses less digits than its factorization.

8009509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63194.

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 8009509 is about 2830.1075951278. The cubic root of 8009509 is about 200.0792102912.

The spelling of 8009509 in words is "eight million, nine thousand, five hundred nine".