243240791 has 2 divisors, whose sum is σ = 243240792. Its totient is φ = 243240790.

The previous prime is 243240761. The next prime is 243240841. The reversal of 243240791 is 197042342.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 243240791 - 2⁶ = 243240727 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 (243240721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121620395 + 121620396.

It is an arithmetic number, because the mean of its divisors is an integer number (121620396).

Almost surely, 2^243240791 is an apocalyptic number.

243240791 is a deficient number, since it is larger than the sum of its proper divisors (1).

243240791 is an equidigital number, since it uses as much as digits as its factorization.

243240791 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 243240791 is about 15596.1787307020. The cubic root of 243240791 is about 624.2311963466.

The spelling of 243240791 in words is "two hundred forty-three million, two hundred forty thousand, seven hundred ninety-one".