505505509 has 8 divisors (see below), whose sum is σ = 517720280. Its totient is φ = 493433856.

The previous prime is 505505501. The next prime is 505505527. The reversal of 505505509 is 905505505.

It can be written as a sum of positive squares in 4 ways, for example, as 238084900 + 267420609 = 15430^2 + 16353^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 505505509 - 2³ = 505505501 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 (505505501) 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, 28614 + ... + 42775.

It is an arithmetic number, because the mean of its divisors is an integer number (64715035).

Almost surely, 2^505505509 is an apocalyptic number.

It is an amenable number.

505505509 is a deficient number, since it is larger than the sum of its proper divisors (12214771).

505505509 is an equidigital number, since it uses as much as digits as its factorization.

505505509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71559.

The product of its (nonzero) digits is 28125, while the sum is 34.

The square root of 505505509 is about 22483.4496685896. The cubic root of 505505509 is about 796.6030489242.

The spelling of 505505509 in words is "five hundred five million, five hundred five thousand, five hundred nine".