289891 has 4 divisors (see below), whose sum is σ = 331312. Its totient is φ = 248472.

The previous prime is 289889. The next prime is 289897. The reversal of 289891 is 198982.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 289891 - 2¹ = 289889 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11.

It is a self number, because there is not a number n which added to its sum of digits gives 289891.

It is not an unprimeable number, because it can be changed into a prime (289897) 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, 20700 + ... + 20713.

It is an arithmetic number, because the mean of its divisors is an integer number (82828).

2²⁸⁹⁸⁹¹ is an apocalyptic number.

289891 is a deficient number, since it is larger than the sum of its proper divisors (41421).

289891 is an equidigital number, since it uses as much as digits as its factorization.

289891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41420.

The product of its digits is 10368, while the sum is 37.

The square root of 289891 is about 538.4152672427. The cubic root of 289891 is about 66.1827655382.

Subtracting from 289891 its reverse (198982), we obtain a palindrome (90909).

The spelling of 289891 in words is "two hundred eighty-nine thousand, eight hundred ninety-one".