242635646189 has 2 divisors, whose sum is σ = 242635646190. Its totient is φ = 242635646188.

The previous prime is 242635646171. The next prime is 242635646243. The reversal of 242635646189 is 981646536242.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 130568040964 + 112067605225 = 361342^2 + 334765^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-242635646189 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (242635646119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121317823094 + 121317823095.

It is an arithmetic number, because the mean of its divisors is an integer number (121317823095).

Almost surely, 2^242635646189 is an apocalyptic number.

It is an amenable number.

242635646189 is a deficient number, since it is larger than the sum of its proper divisors (1).

242635646189 is an equidigital number, since it uses as much as digits as its factorization.

242635646189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14929920, while the sum is 56.

The spelling of 242635646189 in words is "two hundred forty-two billion, six hundred thirty-five million, six hundred forty-six thousand, one hundred eighty-nine".