243323321 has 4 divisors (see below), whose sum is σ = 243384912. Its totient is φ = 243261732.

The previous prime is 243323317. The next prime is 243323341. The reversal of 243323321 is 123323342.

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.

It is a cyclic number.

It is not a de Polignac number, because 243323321 - 2² = 243323317 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243323341) 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 3 ways as a sum of consecutive naturals, for example, 24431 + ... + 32916.

It is an arithmetic number, because the mean of its divisors is an integer number (60846228).

Almost surely, 2^243323321 is an apocalyptic number.

It is an amenable number.

243323321 is a deficient number, since it is larger than the sum of its proper divisors (61591).

243323321 is an equidigital number, since it uses as much as digits as its factorization.

243323321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61590.

The product of its digits is 2592, while the sum is 23.

The square root of 243323321 is about 15598.8243467256. The cubic root of 243323321 is about 624.3017875428.

Adding to 243323321 its reverse (123323342), we get a palindrome (366646663).

The spelling of 243323321 in words is "two hundred forty-three million, three hundred twenty-three thousand, three hundred twenty-one".