289531 has 4 divisors (see below), whose sum is σ = 315864. Its totient is φ = 263200.

The previous prime is 289511. The next prime is 289543. The reversal of 289531 is 135982.

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 289531 - 2⁹ = 289019 is a prime.

It is a super-2 number, since 2×289531² = 167656399922, which contains 22 as substring.

It is a Duffinian number.

289531 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 289531.

It is not an unprimeable number, because it can be changed into a prime (289511) 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, 13150 + ... + 13171.

It is an arithmetic number, because the mean of its divisors is an integer number (78966).

2²⁸⁹⁵³¹ is an apocalyptic number.

289531 is a deficient number, since it is larger than the sum of its proper divisors (26333).

289531 is a wasteful number, since it uses less digits than its factorization.

289531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26332.

The product of its digits is 2160, while the sum is 28.

The square root of 289531 is about 538.0808489437. The cubic root of 289531 is about 66.1553579205.

It can be divided in two parts, 2895 and 31, that added together give a triangular number (2926 = T₇₆).

The spelling of 289531 in words is "two hundred eighty-nine thousand, five hundred thirty-one".