243345435449 has 4 divisors (see below), whose sum is σ = 243346980900. Its totient is φ = 243343890000.

The previous prime is 243345435407. The next prime is 243345435451. The reversal of 243345435449 is 944534543342.

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 178195425424 + 65150010025 = 422132^2 + 255245^2 .

It is a cyclic number.

It is not a de Polignac number, because 243345435449 - 2¹² = 243345431353 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 243345435397 and 243345435406.

It is not an unprimeable number, because it can be changed into a prime (243345435499) 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 in 3 ways as a sum of consecutive naturals, for example, 505802 + ... + 861699.

It is an arithmetic number, because the mean of its divisors is an integer number (60836745225).

Almost surely, 2^243345435449 is an apocalyptic number.

It is an amenable number.

243345435449 is a deficient number, since it is larger than the sum of its proper divisors (1545451).

243345435449 is a wasteful number, since it uses less digits than its factorization.

243345435449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1545450.

The product of its digits is 12441600, while the sum is 50.

The spelling of 243345435449 in words is "two hundred forty-three billion, three hundred forty-five million, four hundred thirty-five thousand, four hundred forty-nine".