243545543 has 2 divisors, whose sum is σ = 243545544. Its totient is φ = 243545542.

The previous prime is 243545537. The next prime is 243545557. The reversal of 243545543 is 345545342.

243545543 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 243545543 - 2⁴ = 243545527 is a prime.

It is a super-3 number, since 3×243545543³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243545503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121772771 + 121772772.

It is an arithmetic number, because the mean of its divisors is an integer number (121772772).

Almost surely, 2^243545543 is an apocalyptic number.

243545543 is a deficient number, since it is larger than the sum of its proper divisors (1).

243545543 is an equidigital number, since it uses as much as digits as its factorization.

243545543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 144000, while the sum is 35.

The square root of 243545543 is about 15605.9457579475. The cubic root of 243545543 is about 624.4917835510.

The spelling of 243545543 in words is "two hundred forty-three million, five hundred forty-five thousand, five hundred forty-three".