508891 has 4 divisors (see below), whose sum is σ = 510984. Its totient is φ = 506800.

The previous prime is 508867. The next prime is 508901. The reversal of 508891 is 198805.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 198805 = 5 ⋅39761.

It is a cyclic number.

It is not a de Polignac number, because 508891 - 2¹¹ = 506843 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (508811) 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, 625 + ... + 1186.

It is an arithmetic number, because the mean of its divisors is an integer number (127746).

2⁵⁰⁸⁸⁹¹ is an apocalyptic number.

508891 is a deficient number, since it is larger than the sum of its proper divisors (2093).

508891 is a wasteful number, since it uses less digits than its factorization.

508891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2092.

The product of its (nonzero) digits is 2880, while the sum is 31.

The square root of 508891 is about 713.3659649857. The cubic root of 508891 is about 79.8377440517.

The spelling of 508891 in words is "five hundred eight thousand, eight hundred ninety-one".