243123201 has 12 divisors (see below), whose sum is σ = 364184912. Its totient is φ = 162081972.

The previous prime is 243123193. The next prime is 243123217. The reversal of 243123201 is 102321342.

243123201 is a `hidden beast` number, since 2 + 431 + 232 + 0 + 1 = 666.

It is not a de Polignac number, because 243123201 - 2³ = 243123193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243123281) 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 in 11 ways as a sum of consecutive naturals, for example, 500011 + ... + 500496.

Almost surely, 2^243123201 is an apocalyptic number.

It is an amenable number.

243123201 is a deficient number, since it is larger than the sum of its proper divisors (121061711).

243123201 is an equidigital number, since it uses as much as digits as its factorization.

243123201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000522 (or 1000510 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 243123201 is about 15592.4084412896. The cubic root of 243123201 is about 624.1305893476.

Adding to 243123201 its reverse (102321342), we get a palindrome (345444543).

The spelling of 243123201 in words is "two hundred forty-three million, one hundred twenty-three thousand, two hundred one".