243289 has 4 divisors (see below), whose sum is σ = 245556. Its totient is φ = 241024.

The previous prime is 243263. The next prime is 243301. The reversal of 243289 is 982342.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 982342 = 2 ⋅491171.

It can be written as a sum of positive squares in 2 ways, for example, as 10000 + 233289 = 100^2 + 483^2 .

It is a cyclic number.

It is not a de Polignac number, because 243289 - 2⁷ = 243161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243209) 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, 964 + ... + 1189.

It is an arithmetic number, because the mean of its divisors is an integer number (61389).

2²⁴³²⁸⁹ is an apocalyptic number.

It is an amenable number.

243289 is a deficient number, since it is larger than the sum of its proper divisors (2267).

243289 is a wasteful number, since it uses less digits than its factorization.

243289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2266.

The product of its digits is 3456, while the sum is 28.

The square root of 243289 is about 493.2433476490. The cubic root of 243289 is about 62.4272433364.

The spelling of 243289 in words is "two hundred forty-three thousand, two hundred eighty-nine".