243140609 has 2 divisors, whose sum is σ = 243140610. Its totient is φ = 243140608.

The previous prime is 243140603. The next prime is 243140617. The reversal of 243140609 is 906041342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 173501584 + 69639025 = 13172^2 + 8345^2 .

It is a cyclic number.

It is not a de Polignac number, because 243140609 - 2¹⁶ = 243075073 is a prime.

It is not a weakly prime, because it can be changed into another prime (243140603) 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, 121570304 + 121570305.

It is an arithmetic number, because the mean of its divisors is an integer number (121570305).

Almost surely, 2^243140609 is an apocalyptic number.

It is an amenable number.

243140609 is a deficient number, since it is larger than the sum of its proper divisors (1).

243140609 is an equidigital number, since it uses as much as digits as its factorization.

243140609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 243140609 is about 15592.9666516670. The cubic root of 243140609 is about 624.1454852330.

The spelling of 243140609 in words is "two hundred forty-three million, one hundred forty thousand, six hundred nine".