289231 has 4 divisors (see below), whose sum is σ = 290752. Its totient is φ = 287712.

The previous prime is 289213. The next prime is 289241. The reversal of 289231 is 132982.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 132982 = 2 ⋅66491.

It is a cyclic number.

It is not a de Polignac number, because 289231 - 2⁷ = 289103 is a prime.

It is a super-2 number, since 2×289231² = 167309142722, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 289196 and 289205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (289241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 426 + ... + 871.

It is an arithmetic number, because the mean of its divisors is an integer number (72688).

2²⁸⁹²³¹ is an apocalyptic number.

289231 is the 311-st hex number.

289231 is a deficient number, since it is larger than the sum of its proper divisors (1521).

289231 is a wasteful number, since it uses less digits than its factorization.

289231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1520.

The product of its digits is 864, while the sum is 25.

The square root of 289231 is about 537.8020081777. The cubic root of 289231 is about 66.1325008793.

The spelling of 289231 in words is "two hundred eighty-nine thousand, two hundred thirty-one".