243445123 has 2 divisors, whose sum is σ = 243445124. Its totient is φ = 243445122.

The previous prime is 243445121. The next prime is 243445129. The reversal of 243445123 is 321544342.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 243445123 - 2¹ = 243445121 is a prime.

Together with 243445121, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 243445091 and 243445100.

It is not a weakly prime, because it can be changed into another prime (243445121) 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, 121722561 + 121722562.

It is an arithmetic number, because the mean of its divisors is an integer number (121722562).

Almost surely, 2^243445123 is an apocalyptic number.

243445123 is a deficient number, since it is larger than the sum of its proper divisors (1).

243445123 is an equidigital number, since it uses as much as digits as its factorization.

243445123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11520, while the sum is 28.

The square root of 243445123 is about 15602.7280627460. The cubic root of 243445123 is about 624.4059404882.

Adding to 243445123 its reverse (321544342), we get a palindrome (564989465).

The spelling of 243445123 in words is "two hundred forty-three million, four hundred forty-five thousand, one hundred twenty-three".