4509509 has 4 divisors (see below), whose sum is σ = 4605504. Its totient is φ = 4413516.

The previous prime is 4509503. The next prime is 4509551. The reversal of 4509509 is 9059054.

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 4509509 - 2⁴ = 4509493 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4509503) 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 in 3 ways as a sum of consecutive naturals, for example, 47927 + ... + 48020.

It is an arithmetic number, because the mean of its divisors is an integer number (1151376).

Almost surely, 2^4509509 is an apocalyptic number.

It is an amenable number.

4509509 is a deficient number, since it is larger than the sum of its proper divisors (95995).

4509509 is an equidigital number, since it uses as much as digits as its factorization.

4509509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95994.

The product of its (nonzero) digits is 8100, while the sum is 32.

The square root of 4509509 is about 2123.5604535779. The cubic root of 4509509 is about 165.2125696162.

The spelling of 4509509 in words is "four million, five hundred nine thousand, five hundred nine".