505509 has 8 divisors (see below), whose sum is σ = 678720. Its totient is φ = 334656.

The previous prime is 505501. The next prime is 505511. The reversal of 505509 is 905505.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 505509 - 2³ = 505501 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4 + ... + 1005.

It is an arithmetic number, because the mean of its divisors is an integer number (84840).

2⁵⁰⁵⁵⁰⁹ is an apocalyptic number.

It is an amenable number.

505509 is a deficient number, since it is larger than the sum of its proper divisors (173211).

505509 is a wasteful number, since it uses less digits than its factorization.

505509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1179.

The product of its (nonzero) digits is 1125, while the sum is 24.

The square root of 505509 is about 710.9915611314. The cubic root of 505509 is about 79.6604882689.

The spelling of 505509 in words is "five hundred five thousand, five hundred nine".