243240501289 has 2 divisors, whose sum is σ = 243240501290. Its totient is φ = 243240501288.

The previous prime is 243240501247. The next prime is 243240501359. The reversal of 243240501289 is 982105042342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 182777625625 + 60462875664 = 427525^2 + 245892^2 .

It is a cyclic number.

It is not a de Polignac number, because 243240501289 - 2³³ = 234650566697 is a prime.

It is not a weakly prime, because it can be changed into another prime (243240508289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121620250644 + 121620250645.

It is an arithmetic number, because the mean of its divisors is an integer number (121620250645).

Almost surely, 2^243240501289 is an apocalyptic number.

It is an amenable number.

243240501289 is a deficient number, since it is larger than the sum of its proper divisors (1).

243240501289 is an equidigital number, since it uses as much as digits as its factorization.

243240501289 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 138240, while the sum is 40.

The spelling of 243240501289 in words is "two hundred forty-three billion, two hundred forty million, five hundred one thousand, two hundred eighty-nine".