28591 has 2 divisors, whose sum is σ = 28592. Its totient is φ = 28590.

The previous prime is 28579. The next prime is 28597. The reversal of 28591 is 19582.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28591 - 2⁵ = 28559 is a prime.

It is a plaindrome in base 12.

It is a nialpdrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28597) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14295 + 14296.

It is an arithmetic number, because the mean of its divisors is an integer number (14296).

2²⁸⁵⁹¹ is an apocalyptic number.

28591 is a deficient number, since it is larger than the sum of its proper divisors (1).

28591 is an equidigital number, since it uses as much as digits as its factorization.

28591 is an evil number, because the sum of its binary digits is even.

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

The square root of 28591 is about 169.0887341014. The cubic root of 28591 is about 30.5780496746.

Subtracting from 28591 its reverse (19582), we obtain a palindrome (9009).

The spelling of 28591 in words is "twenty-eight thousand, five hundred ninety-one".