243115247 has 2 divisors, whose sum is σ = 243115248. Its totient is φ = 243115246.

The previous prime is 243115183. The next prime is 243115253. The reversal of 243115247 is 742511342.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243115247 - 2⁶ = 243115183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243115297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121557623 + 121557624.

It is an arithmetic number, because the mean of its divisors is an integer number (121557624).

Almost surely, 2^243115247 is an apocalyptic number.

243115247 is a deficient number, since it is larger than the sum of its proper divisors (1).

243115247 is an equidigital number, since it uses as much as digits as its factorization.

243115247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6720, while the sum is 29.

The square root of 243115247 is about 15592.1533791840. The cubic root of 243115247 is about 624.1237829372.

Adding to 243115247 its reverse (742511342), we get a palindrome (985626589).

The spelling of 243115247 in words is "two hundred forty-three million, one hundred fifteen thousand, two hundred forty-seven".