242009543 has 2 divisors, whose sum is σ = 242009544. Its totient is φ = 242009542.

The previous prime is 242009507. The next prime is 242009557. The reversal of 242009543 is 345900242.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 242009543 - 2¹⁰ = 242008519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (242009743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121004771 + 121004772.

It is an arithmetic number, because the mean of its divisors is an integer number (121004772).

Almost surely, 2^242009543 is an apocalyptic number.

242009543 is a deficient number, since it is larger than the sum of its proper divisors (1).

242009543 is an equidigital number, since it uses as much as digits as its factorization.

242009543 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 242009543 is about 15556.6559067172. The cubic root of 242009543 is about 623.1761596405.

Adding to 242009543 its reverse (345900242), we get a palindrome (587909785).

The spelling of 242009543 in words is "two hundred forty-two million, nine thousand, five hundred forty-three".