508991 has 16 divisors (see below), whose sum is σ = 633600. Its totient is φ = 399168.

The previous prime is 508987. The next prime is 509023. The reversal of 508991 is 199805.

It is not a de Polignac number, because 508991 - 2² = 508987 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 (508901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5675 + ... + 5763.

It is an arithmetic number, because the mean of its divisors is an integer number (39600).

2⁵⁰⁸⁹⁹¹ is an apocalyptic number.

508991 is a deficient number, since it is larger than the sum of its proper divisors (124609).

508991 is a wasteful number, since it uses less digits than its factorization.

508991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158.

The product of its (nonzero) digits is 3240, while the sum is 32.

The square root of 508991 is about 713.4360517944. The cubic root of 508991 is about 79.8429732341.

The spelling of 508991 in words is "five hundred eight thousand, nine hundred ninety-one".