243147109 has 2 divisors, whose sum is σ = 243147110. Its totient is φ = 243147108.

The previous prime is 243147103. The next prime is 243147119. The reversal of 243147109 is 901741342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 198190084 + 44957025 = 14078^2 + 6705^2 .

It is a cyclic number.

It is not a de Polignac number, because 243147109 - 2⁵ = 243147077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243147103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121573554 + 121573555.

It is an arithmetic number, because the mean of its divisors is an integer number (121573555).

Almost surely, 2^243147109 is an apocalyptic number.

It is an amenable number.

243147109 is a deficient number, since it is larger than the sum of its proper divisors (1).

243147109 is an equidigital number, since it uses as much as digits as its factorization.

243147109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 243147109 is about 15593.1750775780. The cubic root of 243147109 is about 624.1510470483.

The spelling of 243147109 in words is "two hundred forty-three million, one hundred forty-seven thousand, one hundred nine".