243313 has 4 divisors (see below), whose sum is σ = 278080. Its totient is φ = 208548.

The previous prime is 243311. The next prime is 243343. The reversal of 243313 is 313342.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 313342 = 2 ⋅156671.

It is a cyclic number.

It is not a de Polignac number, because 243313 - 2¹ = 243311 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243311) 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, 17373 + ... + 17386.

It is an arithmetic number, because the mean of its divisors is an integer number (69520).

2²⁴³³¹³ is an apocalyptic number.

It is an amenable number.

243313 is a deficient number, since it is larger than the sum of its proper divisors (34767).

243313 is an equidigital number, since it uses as much as digits as its factorization.

243313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34766.

The product of its digits is 216, while the sum is 16.

The square root of 243313 is about 493.2676758110. The cubic root of 243313 is about 62.4292960454.

Adding to 243313 its reverse (313342), we get a palindrome (556655).

The spelling of 243313 in words is "two hundred forty-three thousand, three hundred thirteen".