505771 has 4 divisors (see below), whose sum is σ = 578032. Its totient is φ = 433512.

The previous prime is 505763. The next prime is 505777. The reversal of 505771 is 177505.

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

It is a cyclic number.

It is not a de Polignac number, because 505771 - 2³ = 505763 is a prime.

It is not an unprimeable number, because it can be changed into a prime (505777) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36120 + ... + 36133.

It is an arithmetic number, because the mean of its divisors is an integer number (144508).

2⁵⁰⁵⁷⁷¹ is an apocalyptic number.

505771 is a deficient number, since it is larger than the sum of its proper divisors (72261).

505771 is an equidigital number, since it uses as much as digits as its factorization.

505771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72260.

The product of its (nonzero) digits is 1225, while the sum is 25.

The square root of 505771 is about 711.1757869894. The cubic root of 505771 is about 79.6742482898.

The spelling of 505771 in words is "five hundred five thousand, seven hundred seventy-one".