509506 has 4 divisors (see below), whose sum is σ = 764262. Its totient is φ = 254752.

The previous prime is 509477. The next prime is 509513. The reversal of 509506 is 605905.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 605905 = 5 ⋅121181.

It can be written as a sum of positive squares in only one way, i.e., 342225 + 167281 = 585^2 + 409^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127375 + ... + 127378.

2⁵⁰⁹⁵⁰⁶ is an apocalyptic number.

509506 is a deficient number, since it is larger than the sum of its proper divisors (254756).

509506 is a wasteful number, since it uses less digits than its factorization.

509506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254755.

The product of its (nonzero) digits is 1350, while the sum is 25.

The square root of 509506 is about 713.7968898783. The cubic root of 509506 is about 79.8698926825.

The spelling of 509506 in words is "five hundred nine thousand, five hundred six".