243242999 has 2 divisors, whose sum is σ = 243243000. Its totient is φ = 243242998.

The previous prime is 243242977. The next prime is 243243043. The reversal of 243242999 is 999242342.

It is an a-pointer prime, because the next prime (243243043) can be obtained adding 243242999 to its sum of digits (44).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 243242999 - 2²⁰ = 242194423 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 (243242969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121621499 + 121621500.

It is an arithmetic number, because the mean of its divisors is an integer number (121621500).

Almost surely, 2^243242999 is an apocalyptic number.

243242999 is a deficient number, since it is larger than the sum of its proper divisors (1).

243242999 is an equidigital number, since it uses as much as digits as its factorization.

243242999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 44.

The square root of 243242999 is about 15596.2495171115. The cubic root of 243242999 is about 624.2330851448.

The spelling of 243242999 in words is "two hundred forty-three million, two hundred forty-two thousand, nine hundred ninety-nine".