243045239989 has 2 divisors, whose sum is σ = 243045239990. Its totient is φ = 243045239988.

The previous prime is 243045239939. The next prime is 243045240001. The reversal of 243045239989 is 989932540342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 218516981764 + 24528258225 = 467458^2 + 156615^2 .

It is a cyclic number.

It is not a de Polignac number, because 243045239989 - 2⁷ = 243045239861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243045239939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121522619994 + 121522619995.

It is an arithmetic number, because the mean of its divisors is an integer number (121522619995).

Almost surely, 2^243045239989 is an apocalyptic number.

It is an amenable number.

243045239989 is a deficient number, since it is larger than the sum of its proper divisors (1).

243045239989 is an equidigital number, since it uses as much as digits as its factorization.

243045239989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16796160, while the sum is 58.

The spelling of 243045239989 in words is "two hundred forty-three billion, forty-five million, two hundred thirty-nine thousand, nine hundred eighty-nine".