243199361 has 2 divisors, whose sum is σ = 243199362. Its totient is φ = 243199360.

The previous prime is 243199343. The next prime is 243199459. The reversal of 243199361 is 163991342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 215531761 + 27667600 = 14681^2 + 5260^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243199361 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (243199321) 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, 121599680 + 121599681.

It is an arithmetic number, because the mean of its divisors is an integer number (121599681).

Almost surely, 2^243199361 is an apocalyptic number.

It is an amenable number.

243199361 is a deficient number, since it is larger than the sum of its proper divisors (1).

243199361 is an equidigital number, since it uses as much as digits as its factorization.

243199361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34992, while the sum is 38.

The square root of 243199361 is about 15594.8504641757. The cubic root of 243199361 is about 624.1957535976.

The spelling of 243199361 in words is "two hundred forty-three million, one hundred ninety-nine thousand, three hundred sixty-one".