505081 has 4 divisors (see below), whose sum is σ = 507892. Its totient is φ = 502272.

The previous prime is 505073. The next prime is 505091. The reversal of 505081 is 180505.

505081 is nontrivially palindromic in base 8.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 341056 + 164025 = 584^2 + 405^2 .

It is a cyclic number.

It is not a de Polignac number, because 505081 - 2³ = 505073 is a prime.

It is a super-2 number, since 2×505081² = 510213633122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (505031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1116 + ... + 1501.

It is an arithmetic number, because the mean of its divisors is an integer number (126973).

2⁵⁰⁵⁰⁸¹ is an apocalyptic number.

It is an amenable number.

505081 is a deficient number, since it is larger than the sum of its proper divisors (2811).

505081 is a wasteful number, since it uses less digits than its factorization.

505081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2810.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 505081 is about 710.6905092936. The cubic root of 505081 is about 79.6379998359.

Adding to 505081 its reverse (180505), we get a palindrome (685586).

The spelling of 505081 in words is "five hundred five thousand, eighty-one".