243008009 has 2 divisors, whose sum is σ = 243008010. Its totient is φ = 243008008.

The previous prime is 243007993. The next prime is 243008053. The reversal of 243008009 is 900800342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 145926400 + 97081609 = 12080^2 + 9853^2 .

It is a cyclic number.

It is not a de Polignac number, because 243008009 - 2⁴ = 243007993 is a prime.

It is a Chen prime.

It is equal to p_13317326 and since 243008009 and 13317326 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (243008089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121504004 + 121504005.

It is an arithmetic number, because the mean of its divisors is an integer number (121504005).

Almost surely, 2^243008009 is an apocalyptic number.

It is an amenable number.

243008009 is a deficient number, since it is larger than the sum of its proper divisors (1).

243008009 is an equidigital number, since it uses as much as digits as its factorization.

243008009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 243008009 is about 15588.7141547980. The cubic root of 243008009 is about 624.0320025569.

The spelling of 243008009 in words is "two hundred forty-three million, eight thousand, nine".