243423449 has 2 divisors, whose sum is σ = 243423450. Its totient is φ = 243423448.

The previous prime is 243423431. The next prime is 243423451. The reversal of 243423449 is 944324342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 226051225 + 17372224 = 15035^2 + 4168^2 .

It is a cyclic number.

It is not a de Polignac number, because 243423449 - 2¹⁶ = 243357913 is a prime.

Together with 243423451, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (243423409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121711724 + 121711725.

It is an arithmetic number, because the mean of its divisors is an integer number (121711725).

Almost surely, 2^243423449 is an apocalyptic number.

It is an amenable number.

243423449 is a deficient number, since it is larger than the sum of its proper divisors (1).

243423449 is an equidigital number, since it uses as much as digits as its factorization.

243423449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82944, while the sum is 35.

The square root of 243423449 is about 15602.0334892603. The cubic root of 243423449 is about 624.3874095823.

The spelling of 243423449 in words is "two hundred forty-three million, four hundred twenty-three thousand, four hundred forty-nine".