512509 has 4 divisors (see below), whose sum is σ = 534816. Its totient is φ = 490204.

The previous prime is 512507. The next prime is 512521. The reversal of 512509 is 905215.

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 512509 - 2¹ = 512507 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 512509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (512503) 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, 11119 + ... + 11164.

It is an arithmetic number, because the mean of its divisors is an integer number (133704).

2⁵¹²⁵⁰⁹ is an apocalyptic number.

It is an amenable number.

512509 is a deficient number, since it is larger than the sum of its proper divisors (22307).

512509 is a wasteful number, since it uses less digits than its factorization.

512509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22306.

The product of its (nonzero) digits is 450, while the sum is 22.

The square root of 512509 is about 715.8973390089. The cubic root of 512509 is about 80.0265016365.

The spelling of 512509 in words is "five hundred twelve thousand, five hundred nine".