243320849 has 2 divisors, whose sum is σ = 243320850. Its totient is φ = 243320848.

The previous prime is 243320771. The next prime is 243320921. The reversal of 243320849 is 948023342.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 200024449 + 43296400 = 14143^2 + 6580^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243320849 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (243320149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121660424 + 121660425.

It is an arithmetic number, because the mean of its divisors is an integer number (121660425).

Almost surely, 2^243320849 is an apocalyptic number.

It is an amenable number.

243320849 is a deficient number, since it is larger than the sum of its proper divisors (1).

243320849 is an equidigital number, since it uses as much as digits as its factorization.

243320849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 35.

The square root of 243320849 is about 15598.7451097837. The cubic root of 243320849 is about 624.2996733746.

The spelling of 243320849 in words is "two hundred forty-three million, three hundred twenty thousand, eight hundred forty-nine".