243264200989 has 2 divisors, whose sum is σ = 243264200990. Its totient is φ = 243264200988.

The previous prime is 243264200987. The next prime is 243264201001. The reversal of 243264200989 is 989002462342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 229975875364 + 13288325625 = 479558^2 + 115275^2 .

It is a cyclic number.

It is not a de Polignac number, because 243264200989 - 2¹ = 243264200987 is a prime.

Together with 243264200987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243264200983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121632100494 + 121632100495.

It is an arithmetic number, because the mean of its divisors is an integer number (121632100495).

Almost surely, 2^243264200989 is an apocalyptic number.

It is an amenable number.

243264200989 is a deficient number, since it is larger than the sum of its proper divisors (1).

243264200989 is an equidigital number, since it uses as much as digits as its factorization.

243264200989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1492992, while the sum is 49.

The spelling of 243264200989 in words is "two hundred forty-three billion, two hundred sixty-four million, two hundred thousand, nine hundred eighty-nine".