243212047 has 16 divisors (see below), whose sum is σ = 279810720. Its totient is φ = 209405952.

The previous prime is 243212023. The next prime is 243212083. The reversal of 243212047 is 740212342.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 243212047 - 2⁷ = 243211919 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243212017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20104 + ... + 29842.

It is an arithmetic number, because the mean of its divisors is an integer number (17488170).

Almost surely, 2^243212047 is an apocalyptic number.

243212047 is a deficient number, since it is larger than the sum of its proper divisors (36598673).

243212047 is a wasteful number, since it uses less digits than its factorization.

243212047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9882.

The product of its (nonzero) digits is 2688, while the sum is 25.

The square root of 243212047 is about 15595.2571956990. The cubic root of 243212047 is about 624.2066067095.

Adding to 243212047 its reverse (740212342), we get a palindrome (983424389).

The spelling of 243212047 in words is "two hundred forty-three million, two hundred twelve thousand, forty-seven".