208591 has 2 divisors, whose sum is σ = 208592. Its totient is φ = 208590.

The previous prime is 208589. The next prime is 208609. The reversal of 208591 is 195802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 208591 - 2¹ = 208589 is a prime.

Together with 208589, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (208501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104295 + 104296.

It is an arithmetic number, because the mean of its divisors is an integer number (104296).

2²⁰⁸⁵⁹¹ is an apocalyptic number.

208591 is a deficient number, since it is larger than the sum of its proper divisors (1).

208591 is an equidigital number, since it uses as much as digits as its factorization.

208591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 208591 is about 456.7176370582. The cubic root of 208591 is about 59.3059848151.

The spelling of 208591 in words is "two hundred eight thousand, five hundred ninety-one".