243323453 has 4 divisors (see below), whose sum is σ = 243355548. Its totient is φ = 243291360.

The previous prime is 243323441. The next prime is 243323459. The reversal of 243323453 is 354323342.

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 84235684 + 159087769 = 9178^2 + 12613^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243323453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243323459) 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, 2375 + ... + 22187.

It is an arithmetic number, because the mean of its divisors is an integer number (60838887).

Almost surely, 2^243323453 is an apocalyptic number.

It is an amenable number.

243323453 is a deficient number, since it is larger than the sum of its proper divisors (32095).

243323453 is a wasteful number, since it uses less digits than its factorization.

243323453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32094.

The product of its digits is 25920, while the sum is 29.

The square root of 243323453 is about 15598.8285778131. The cubic root of 243323453 is about 624.3019004348.

Adding to 243323453 its reverse (354323342), we get a palindrome (597646795).

The spelling of 243323453 in words is "two hundred forty-three million, three hundred twenty-three thousand, four hundred fifty-three".