243043249 has 2 divisors, whose sum is σ = 243043250. Its totient is φ = 243043248.

The previous prime is 243043223. The next prime is 243043259. The reversal of 243043249 is 942340342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 242362624 + 680625 = 15568^2 + 825^2 .

It is a cyclic number.

It is not a de Polignac number, because 243043249 - 2²⁵ = 209488817 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 243043249.

It is not a weakly prime, because it can be changed into another prime (243043259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121521624 + 121521625.

It is an arithmetic number, because the mean of its divisors is an integer number (121521625).

Almost surely, 2^243043249 is an apocalyptic number.

It is an amenable number.

243043249 is a deficient number, since it is larger than the sum of its proper divisors (1).

243043249 is an equidigital number, since it uses as much as digits as its factorization.

243043249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 31.

The square root of 243043249 is about 15589.8444187234. The cubic root of 243043249 is about 624.0621659315.

It can be divided in two parts, 2430432 and 49, that added together give a square (2430481 = 1559²).

The spelling of 243043249 in words is "two hundred forty-three million, forty-three thousand, two hundred forty-nine".