243779449 has 2 divisors, whose sum is σ = 243779450. Its totient is φ = 243779448.

The previous prime is 243779447. The next prime is 243779479. The reversal of 243779449 is 944977342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 240467049 + 3312400 = 15507^2 + 1820^2 .

It is a cyclic number.

It is not a de Polignac number, because 243779449 - 2¹ = 243779447 is a prime.

Together with 243779447, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (243779447) 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, 121889724 + 121889725.

It is an arithmetic number, because the mean of its divisors is an integer number (121889725).

Almost surely, 2^243779449 is an apocalyptic number.

It is an amenable number.

243779449 is a deficient number, since it is larger than the sum of its proper divisors (1).

243779449 is an equidigital number, since it uses as much as digits as its factorization.

243779449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1524096, while the sum is 49.

The square root of 243779449 is about 15613.4380903118. The cubic root of 243779449 is about 624.6916443719.

The spelling of 243779449 in words is "two hundred forty-three million, seven hundred seventy-nine thousand, four hundred forty-nine".