491289 has 8 divisors (see below), whose sum is σ = 677760. Its totient is φ = 316176.

The previous prime is 491279. The next prime is 491297. The reversal of 491289 is 982194.

491289 = 62² + 63² + ... + 119².

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 491289 - 2⁴ = 491273 is a prime.

It is not an unprimeable number, because it can be changed into a prime (491219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2737 + ... + 2910.

It is an arithmetic number, because the mean of its divisors is an integer number (84720).

2⁴⁹¹²⁸⁹ is an apocalyptic number.

It is an amenable number.

491289 is a deficient number, since it is larger than the sum of its proper divisors (186471).

491289 is a wasteful number, since it uses less digits than its factorization.

491289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5679.

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

The square root of 491289 is about 700.9201095703. The cubic root of 491289 is about 78.9064212688.

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

The spelling of 491289 in words is "four hundred ninety-one thousand, two hundred eighty-nine".