243505003109 has 2 divisors, whose sum is σ = 243505003110. Its totient is φ = 243505003108.

The previous prime is 243505003103. The next prime is 243505003139. The reversal of 243505003109 is 901300505342.

243505003109 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 243341930209 + 163072900 = 493297^2 + 12770^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243505003109 is a prime.

It is a super-2 number, since 2×243505003109² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243505003103) 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, 121752501554 + 121752501555.

It is an arithmetic number, because the mean of its divisors is an integer number (121752501555).

Almost surely, 2^243505003109 is an apocalyptic number.

It is an amenable number.

243505003109 is a deficient number, since it is larger than the sum of its proper divisors (1).

243505003109 is an equidigital number, since it uses as much as digits as its factorization.

243505003109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16200, while the sum is 32.

The spelling of 243505003109 in words is "two hundred forty-three billion, five hundred five million, three thousand, one hundred nine".