243153109 has 2 divisors, whose sum is σ = 243153110. Its totient is φ = 243153108.

The previous prime is 243153077. The next prime is 243153121. The reversal of 243153109 is 901351342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 145202500 + 97950609 = 12050^2 + 9897^2 .

It is a cyclic number.

It is not a de Polignac number, because 243153109 - 2⁵ = 243153077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243153199) 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, 121576554 + 121576555.

It is an arithmetic number, because the mean of its divisors is an integer number (121576555).

Almost surely, 2^243153109 is an apocalyptic number.

It is an amenable number.

243153109 is a deficient number, since it is larger than the sum of its proper divisors (1).

243153109 is an equidigital number, since it uses as much as digits as its factorization.

243153109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 243153109 is about 15593.3674682539. The cubic root of 243153109 is about 624.1561809437.

The spelling of 243153109 in words is "two hundred forty-three million, one hundred fifty-three thousand, one hundred nine".