243020332309 has 2 divisors, whose sum is σ = 243020332310. Its totient is φ = 243020332308.

The previous prime is 243020332307. The next prime is 243020332319. The reversal of 243020332309 is 903233020342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 193859687025 + 49160645284 = 440295^2 + 221722^2 .

It is a cyclic number.

It is not a de Polignac number, because 243020332309 - 2¹ = 243020332307 is a prime.

Together with 243020332307, 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 (243020332301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121510166154 + 121510166155.

It is an arithmetic number, because the mean of its divisors is an integer number (121510166155).

Almost surely, 2^243020332309 is an apocalyptic number.

It is an amenable number.

243020332309 is a deficient number, since it is larger than the sum of its proper divisors (1).

243020332309 is an equidigital number, since it uses as much as digits as its factorization.

243020332309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 31.

The spelling of 243020332309 in words is "two hundred forty-three billion, twenty million, three hundred thirty-two thousand, three hundred nine".