243243533 has 4 divisors (see below), whose sum is σ = 261954588. Its totient is φ = 224532480.

The previous prime is 243243523. The next prime is 243243557. The reversal of 243243533 is 335342342.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 157828969 + 85414564 = 12563^2 + 9242^2 .

It is a cyclic number.

It is not a de Polignac number, because 243243533 - 2¹⁰ = 243242509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 243243496 and 243243505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243243523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9355508 + ... + 9355533.

It is an arithmetic number, because the mean of its divisors is an integer number (65488647).

Almost surely, 2^243243533 is an apocalyptic number.

It is an amenable number.

243243533 is a deficient number, since it is larger than the sum of its proper divisors (18711055).

243243533 is a wasteful number, since it uses less digits than its factorization.

243243533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18711054.

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

The square root of 243243533 is about 15596.2666366025. The cubic root of 243243533 is about 624.2335419448.

Adding to 243243533 its reverse (335342342), we get a palindrome (578585875).

The spelling of 243243533 in words is "two hundred forty-three million, two hundred forty-three thousand, five hundred thirty-three".