505801 has 4 divisors (see below), whose sum is σ = 535572. Its totient is φ = 476032.

The previous prime is 505781. The next prime is 505811. The reversal of 505801 is 108505.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 108505 = 5 ⋅21701.

It can be written as a sum of positive squares in 2 ways, for example, as 455625 + 50176 = 675^2 + 224^2 .

It is a cyclic number.

It is not a de Polignac number, because 505801 - 2¹¹ = 503753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (505811) 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, 14860 + ... + 14893.

It is an arithmetic number, because the mean of its divisors is an integer number (133893).

2⁵⁰⁵⁸⁰¹ is an apocalyptic number.

It is an amenable number.

505801 is a deficient number, since it is larger than the sum of its proper divisors (29771).

505801 is a wasteful number, since it uses less digits than its factorization.

505801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29770.

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

The square root of 505801 is about 711.1968785083. The cubic root of 505801 is about 79.6758235615.

The spelling of 505801 in words is "five hundred five thousand, eight hundred one".