505871 has 2 divisors, whose sum is σ = 505872. Its totient is φ = 505870.

The previous prime is 505867. The next prime is 505877. The reversal of 505871 is 178505.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 505871 - 2² = 505867 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 505871.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 505871.

It is not a weakly prime, because it can be changed into another prime (505877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252935 + 252936.

It is an arithmetic number, because the mean of its divisors is an integer number (252936).

2⁵⁰⁵⁸⁷¹ is an apocalyptic number.

505871 is a deficient number, since it is larger than the sum of its proper divisors (1).

505871 is an equidigital number, since it uses as much as digits as its factorization.

505871 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1400, while the sum is 26.

The square root of 505871 is about 711.2460896202. The cubic root of 505871 is about 79.6794989532.

The spelling of 505871 in words is "five hundred five thousand, eight hundred seventy-one".