243545669 has 2 divisors, whose sum is σ = 243545670. Its totient is φ = 243545668.

The previous prime is 243545657. The next prime is 243545707. The reversal of 243545669 is 966545342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 204633025 + 38912644 = 14305^2 + 6238^2 .

It is a cyclic number.

It is not a de Polignac number, because 243545669 - 2²⁰ = 242497093 is a prime.

It is a super-3 number, since 3×243545669³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243545639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121772834 + 121772835.

It is an arithmetic number, because the mean of its divisors is an integer number (121772835).

Almost surely, 2^243545669 is an apocalyptic number.

It is an amenable number.

243545669 is a deficient number, since it is larger than the sum of its proper divisors (1).

243545669 is an equidigital number, since it uses as much as digits as its factorization.

243545669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 777600, while the sum is 44.

The square root of 243545669 is about 15605.9497948699. The cubic root of 243545669 is about 624.4918912461.

The spelling of 243545669 in words is "two hundred forty-three million, five hundred forty-five thousand, six hundred sixty-nine".