243264217387 has 2 divisors, whose sum is σ = 243264217388. Its totient is φ = 243264217386.

The previous prime is 243264217373. The next prime is 243264217421. The reversal of 243264217387 is 783712462342.

243264217387 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 243264217387 - 2¹¹ = 243264215339 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 243264217387.

It is not a weakly prime, because it can be changed into another prime (243264215387) 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 as a sum of consecutive naturals, namely, 121632108693 + 121632108694.

It is an arithmetic number, because the mean of its divisors is an integer number (121632108694).

Almost surely, 2^243264217387 is an apocalyptic number.

243264217387 is a deficient number, since it is larger than the sum of its proper divisors (1).

243264217387 is an equidigital number, since it uses as much as digits as its factorization.

243264217387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2709504, while the sum is 49.

The spelling of 243264217387 in words is "two hundred forty-three billion, two hundred sixty-four million, two hundred seventeen thousand, three hundred eighty-seven".