243040247 has 2 divisors, whose sum is σ = 243040248. Its totient is φ = 243040246.

The previous prime is 243040201. The next prime is 243040321. The reversal of 243040247 is 742040342.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 243040247 - 2¹⁸ = 242778103 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243090247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121520123 + 121520124.

It is an arithmetic number, because the mean of its divisors is an integer number (121520124).

Almost surely, 2^243040247 is an apocalyptic number.

243040247 is a deficient number, since it is larger than the sum of its proper divisors (1).

243040247 is an equidigital number, since it uses as much as digits as its factorization.

243040247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5376, while the sum is 26.

The square root of 243040247 is about 15589.7481377988. The cubic root of 243040247 is about 624.0595965091.

Adding to 243040247 its reverse (742040342), we get a palindrome (985080589).

The spelling of 243040247 in words is "two hundred forty-three million, forty thousand, two hundred forty-seven".