500000509 has 4 divisors (see below), whose sum is σ = 500696640. Its totient is φ = 499304380.

The previous prime is 500000507. The next prime is 500000539. The reversal of 500000509 is 905000005.

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 500000509 - 2¹ = 500000507 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 (500000507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 346987 + ... + 348424.

It is an arithmetic number, because the mean of its divisors is an integer number (125174160).

Almost surely, 2^500000509 is an apocalyptic number.

It is an amenable number.

500000509 is a deficient number, since it is larger than the sum of its proper divisors (696131).

500000509 is an equidigital number, since it uses as much as digits as its factorization.

500000509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 696130.

The product of its (nonzero) digits is 225, while the sum is 19.

The square root of 500000509 is about 22360.6911565810. The cubic root of 500000509 is about 793.7007953131.

The spelling of 500000509 in words is "five hundred million, five hundred nine", and thus it is an aban number.