243909269 has 2 divisors, whose sum is σ = 243909270. Its totient is φ = 243909268.

The previous prime is 243909229. The next prime is 243909283. The reversal of 243909269 is 962909342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 243672100 + 237169 = 15610^2 + 487^2 .

It is a cyclic number.

It is not a de Polignac number, because 243909269 - 2¹² = 243905173 is a prime.

It is a super-2 number, since 2×243909269² = 118983463008228722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243909229) 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 as a sum of consecutive naturals, namely, 121954634 + 121954635.

It is an arithmetic number, because the mean of its divisors is an integer number (121954635).

Almost surely, 2^243909269 is an apocalyptic number.

It is an amenable number.

243909269 is a deficient number, since it is larger than the sum of its proper divisors (1).

243909269 is an equidigital number, since it uses as much as digits as its factorization.

243909269 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 209952, while the sum is 44.

The square root of 243909269 is about 15617.5948532416. The cubic root of 243909269 is about 624.8025138186.

The spelling of 243909269 in words is "two hundred forty-three million, nine hundred nine thousand, two hundred sixty-nine".