243198401 has 2 divisors, whose sum is σ = 243198402. Its totient is φ = 243198400.

The previous prime is 243198391. The next prime is 243198407. The reversal of 243198401 is 104891342.

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., 169650625 + 73547776 = 13025^2 + 8576^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243198401 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (243198407) 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, 121599200 + 121599201.

It is an arithmetic number, because the mean of its divisors is an integer number (121599201).

Almost surely, 2^243198401 is an apocalyptic number.

It is an amenable number.

243198401 is a deficient number, since it is larger than the sum of its proper divisors (1).

243198401 is an equidigital number, since it uses as much as digits as its factorization.

243198401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 243198401 is about 15594.8196847543. The cubic root of 243198401 is about 624.1949322842.

The spelling of 243198401 in words is "two hundred forty-three million, one hundred ninety-eight thousand, four hundred one".