243332321 has 4 divisors (see below), whose sum is σ = 243364500. Its totient is φ = 243300144.

The previous prime is 243332317. The next prime is 243332371. The reversal of 243332321 is 123233342.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 170041600 + 73290721 = 13040^2 + 8561^2 .

It is a cyclic number.

It is not a de Polignac number, because 243332321 - 2² = 243332317 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243332311) 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, 2135 + ... + 22163.

It is an arithmetic number, because the mean of its divisors is an integer number (60841125).

Almost surely, 2^243332321 is an apocalyptic number.

It is an amenable number.

243332321 is a deficient number, since it is larger than the sum of its proper divisors (32179).

243332321 is a wasteful number, since it uses less digits than its factorization.

243332321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32178.

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

The square root of 243332321 is about 15599.1128273373. The cubic root of 243332321 is about 624.3094846359.

Adding to 243332321 its reverse (123233342), we get a palindrome (366565663).

The spelling of 243332321 in words is "two hundred forty-three million, three hundred thirty-two thousand, three hundred twenty-one".