243243310109 has 4 divisors (see below), whose sum is σ = 245474900220. Its totient is φ = 241011720000.

The previous prime is 243243310097. The next prime is 243243310117. The reversal of 243243310109 is 901013342342.

243243310109 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 111858809209 + 131384500900 = 334453^2 + 362470^2 .

It is a cyclic number.

It is not a de Polignac number, because 243243310109 - 2¹² = 243243306013 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243243310159) 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 in 3 ways as a sum of consecutive naturals, for example, 1115794892 + ... + 1115795109.

It is an arithmetic number, because the mean of its divisors is an integer number (61368725055).

Almost surely, 2^243243310109 is an apocalyptic number.

It is an amenable number.

243243310109 is a deficient number, since it is larger than the sum of its proper divisors (2231590111).

243243310109 is a wasteful number, since it uses less digits than its factorization.

243243310109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2231590110.

The product of its (nonzero) digits is 15552, while the sum is 32.

The spelling of 243243310109 in words is "two hundred forty-three billion, two hundred forty-three million, three hundred ten thousand, one hundred nine".