505851 has 4 divisors (see below), whose sum is σ = 674472. Its totient is φ = 337232.

The previous prime is 505823. The next prime is 505867. The reversal of 505851 is 158505.

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 505851 - 2⁵ = 505819 is a prime.

It is a D-number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 505851.

It is not an unprimeable number, because it can be changed into a prime (505811) 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, 84306 + ... + 84311.

It is an arithmetic number, because the mean of its divisors is an integer number (168618).

2⁵⁰⁵⁸⁵¹ is an apocalyptic number.

505851 is a deficient number, since it is larger than the sum of its proper divisors (168621).

505851 is a wasteful number, since it uses less digits than its factorization.

505851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168620.

The product of its (nonzero) digits is 1000, while the sum is 24.

The square root of 505851 is about 711.2320296500. The cubic root of 505851 is about 79.6784488759.

The spelling of 505851 in words is "five hundred five thousand, eight hundred fifty-one".