243516197 has 2 divisors, whose sum is σ = 243516198. Its totient is φ = 243516196.

The previous prime is 243516173. The next prime is 243516241. The reversal of 243516197 is 791615342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 196168036 + 47348161 = 14006^2 + 6881^2 .

It is a cyclic number.

It is not a de Polignac number, because 243516197 - 2²² = 239321893 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 243516197.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243516127) 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, 121758098 + 121758099.

It is an arithmetic number, because the mean of its divisors is an integer number (121758099).

Almost surely, 2^243516197 is an apocalyptic number.

It is an amenable number.

243516197 is a deficient number, since it is larger than the sum of its proper divisors (1).

243516197 is an equidigital number, since it uses as much as digits as its factorization.

243516197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45360, while the sum is 38.

The square root of 243516197 is about 15605.0055110532. The cubic root of 243516197 is about 624.4666998483.

The spelling of 243516197 in words is "two hundred forty-three million, five hundred sixteen thousand, one hundred ninety-seven".