98591 has 4 divisors (see below), whose sum is σ = 103800. Its totient is φ = 93384.

The previous prime is 98573. The next prime is 98597. The reversal of 98591 is 19589.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19589 = 19 ⋅1031.

It is a cyclic number.

It is not a de Polignac number, because 98591 - 2¹⁴ = 82207 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 (98597) 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, 2576 + ... + 2613.

It is an arithmetic number, because the mean of its divisors is an integer number (25950).

2⁹⁸⁵⁹¹ is an apocalyptic number.

98591 is a deficient number, since it is larger than the sum of its proper divisors (5209).

98591 is a wasteful number, since it uses less digits than its factorization.

98591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5208.

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

The square root of 98591 is about 313.9920381156. The cubic root of 98591 is about 46.1968564167.

The spelling of 98591 in words is "ninety-eight thousand, five hundred ninety-one".