243533 has 2 divisors, whose sum is σ = 243534. Its totient is φ = 243532.

The previous prime is 243527. The next prime is 243539. The reversal of 243533 is 335342.

It is a balanced prime because it is at equal distance from previous prime (243527) and next prime (243539).

It can be written as a sum of positive squares in only one way, i.e., 243049 + 484 = 493^2 + 22^2 .

It is a cyclic number.

It is not a de Polignac number, because 243533 - 2⁴ = 243517 is a prime.

It is a super-3 number, since 3×243533³ = 43330600809901311, which contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121766 + 121767.

It is an arithmetic number, because the mean of its divisors is an integer number (121767).

2²⁴³⁵³³ is an apocalyptic number.

It is an amenable number.

243533 is a deficient number, since it is larger than the sum of its proper divisors (1).

243533 is an equidigital number, since it uses as much as digits as its factorization.

243533 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1080, while the sum is 20.

The square root of 243533 is about 493.4906280772. The cubic root of 243533 is about 62.4481062579.

Adding to 243533 its reverse (335342), we get a palindrome (578875).

Subtracting 243533 from its reverse (335342), we obtain a square (91809 = 303²).

The spelling of 243533 in words is "two hundred forty-three thousand, five hundred thirty-three".