242905172089 has 2 divisors, whose sum is σ = 242905172090. Its totient is φ = 242905172088.

The previous prime is 242905172017. The next prime is 242905172099. The reversal of 242905172089 is 980271509242.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 170307258489 + 72597913600 = 412683^2 + 269440^2 .

It is a cyclic number.

It is not a de Polignac number, because 242905172089 - 2⁹ = 242905171577 is a prime.

It is not a weakly prime, because it can be changed into another prime (242905172099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121452586044 + 121452586045.

It is an arithmetic number, because the mean of its divisors is an integer number (121452586045).

Almost surely, 2^242905172089 is an apocalyptic number.

It is an amenable number.

242905172089 is a deficient number, since it is larger than the sum of its proper divisors (1).

242905172089 is an equidigital number, since it uses as much as digits as its factorization.

242905172089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 725760, while the sum is 49.

The spelling of 242905172089 in words is "two hundred forty-two billion, nine hundred five million, one hundred seventy-two thousand, eighty-nine".