243089317 has 2 divisors, whose sum is σ = 243089318. Its totient is φ = 243089316.

The previous prime is 243089309. The next prime is 243089351. The reversal of 243089317 is 713980342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 242393761 + 695556 = 15569^2 + 834^2 .

It is a cyclic number.

It is not a de Polignac number, because 243089317 - 2³ = 243089309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243089377) 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, 121544658 + 121544659.

It is an arithmetic number, because the mean of its divisors is an integer number (121544659).

Almost surely, 2^243089317 is an apocalyptic number.

It is an amenable number.

243089317 is a deficient number, since it is larger than the sum of its proper divisors (1).

243089317 is an equidigital number, since it uses as much as digits as its factorization.

243089317 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 243089317 is about 15591.3218490287. The cubic root of 243089317 is about 624.1015930427.

The spelling of 243089317 in words is "two hundred forty-three million, eighty-nine thousand, three hundred seventeen".