289491 has 4 divisors (see below), whose sum is σ = 385992. Its totient is φ = 192992.

The previous prime is 289489. The next prime is 289511. The reversal of 289491 is 194982.

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

It is a cyclic number.

It is not a de Polignac number, because 289491 - 2¹ = 289489 is a prime.

It is a D-number.

289491 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 289491.

It is not an unprimeable number, because it can be changed into a prime (289291) 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, 48246 + ... + 48251.

It is an arithmetic number, because the mean of its divisors is an integer number (96498).

2²⁸⁹⁴⁹¹ is an apocalyptic number.

289491 is a deficient number, since it is larger than the sum of its proper divisors (96501).

289491 is an equidigital number, since it uses as much as digits as its factorization.

289491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96500.

The product of its digits is 5184, while the sum is 33.

The square root of 289491 is about 538.0436785243. The cubic root of 289491 is about 66.1523112276.

It can be divided in two parts, 289 and 491, that added together give a triangular number (780 = T₃₉).

The spelling of 289491 in words is "two hundred eighty-nine thousand, four hundred ninety-one".