242705189 has 2 divisors, whose sum is σ = 242705190. Its totient is φ = 242705188.

The previous prime is 242705171. The next prime is 242705249. The reversal of 242705189 is 981507242.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 220284964 + 22420225 = 14842^2 + 4735^2 .

It is a cyclic number.

It is not a de Polignac number, because 242705189 - 2⁸ = 242704933 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (242705119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121352594 + 121352595.

It is an arithmetic number, because the mean of its divisors is an integer number (121352595).

Almost surely, 2^242705189 is an apocalyptic number.

It is an amenable number.

242705189 is a deficient number, since it is larger than the sum of its proper divisors (1).

242705189 is an equidigital number, since it uses as much as digits as its factorization.

242705189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 242705189 is about 15578.9983310866. The cubic root of 242705189 is about 623.7726861119.

The spelling of 242705189 in words is "two hundred forty-two million, seven hundred five thousand, one hundred eighty-nine".