243733439569 has 2 divisors, whose sum is σ = 243733439570. Its totient is φ = 243733439568.

The previous prime is 243733439563. The next prime is 243733439581. The reversal of 243733439569 is 965934337342.

243733439569 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., 186451240000 + 57282199569 = 431800^2 + 239337^2 .

It is a cyclic number.

It is not a de Polignac number, because 243733439569 - 2¹³ = 243733431377 is a prime.

It is a super-2 number, since 2×243733439569² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (243733439563) 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, 121866719784 + 121866719785.

It is an arithmetic number, because the mean of its divisors is an integer number (121866719785).

Almost surely, 2^243733439569 is an apocalyptic number.

It is an amenable number.

243733439569 is a deficient number, since it is larger than the sum of its proper divisors (1).

243733439569 is an equidigital number, since it uses as much as digits as its factorization.

243733439569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 44089920, while the sum is 58.

The spelling of 243733439569 in words is "two hundred forty-three billion, seven hundred thirty-three million, four hundred thirty-nine thousand, five hundred sixty-nine".