243121240489 has 2 divisors, whose sum is σ = 243121240490. Its totient is φ = 243121240488.

The previous prime is 243121240379. The next prime is 243121240511. The reversal of 243121240489 is 984042121342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 165269080089 + 77852160400 = 406533^2 + 279020^2 .

It is a cyclic number.

It is not a de Polignac number, because 243121240489 - 2¹³ = 243121232297 is a prime.

It is not a weakly prime, because it can be changed into another prime (243121240889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121560620244 + 121560620245.

It is an arithmetic number, because the mean of its divisors is an integer number (121560620245).

Almost surely, 2^243121240489 is an apocalyptic number.

It is an amenable number.

243121240489 is a deficient number, since it is larger than the sum of its proper divisors (1).

243121240489 is an equidigital number, since it uses as much as digits as its factorization.

243121240489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 110592, while the sum is 40.

The spelling of 243121240489 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred forty thousand, four hundred eighty-nine".