989591 has 4 divisors (see below), whose sum is σ = 1000800. Its totient is φ = 978384.

The previous prime is 989581. The next prime is 989623. The reversal of 989591 is 195989.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 195989 = 37 ⋅5297.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-989591 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 (989561) 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, 5471 + ... + 5648.

It is an arithmetic number, because the mean of its divisors is an integer number (250200).

2⁹⁸⁹⁵⁹¹ is an apocalyptic number.

989591 is a deficient number, since it is larger than the sum of its proper divisors (11209).

989591 is a wasteful number, since it uses less digits than its factorization.

989591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11208.

The product of its digits is 29160, while the sum is 41.

The square root of 989591 is about 994.7818856413. The cubic root of 989591 is about 99.6518224643.

The spelling of 989591 in words is "nine hundred eighty-nine thousand, five hundred ninety-one".