242018009 has 2 divisors, whose sum is σ = 242018010. Its totient is φ = 242018008.

The previous prime is 242017987. The next prime is 242018033. The reversal of 242018009 is 900810242.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 206353225 + 35664784 = 14365^2 + 5972^2 .

It is a cyclic number.

It is not a de Polignac number, because 242018009 - 2²⁰ = 240969433 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (242018099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121009004 + 121009005.

It is an arithmetic number, because the mean of its divisors is an integer number (121009005).

Almost surely, 2^242018009 is an apocalyptic number.

It is an amenable number.

242018009 is a deficient number, since it is larger than the sum of its proper divisors (1).

242018009 is an equidigital number, since it uses as much as digits as its factorization.

242018009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 242018009 is about 15556.9280065185. The cubic root of 242018009 is about 623.1834262243.

The spelling of 242018009 in words is "two hundred forty-two million, eighteen thousand, nine".