242507789 has 2 divisors, whose sum is σ = 242507790. Its totient is φ = 242507788.

The previous prime is 242507747. The next prime is 242507819. The reversal of 242507789 is 987705242.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 126945289 + 115562500 = 11267^2 + 10750^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-242507789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (242507719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121253894 + 121253895.

It is an arithmetic number, because the mean of its divisors is an integer number (121253895).

Almost surely, 2^242507789 is an apocalyptic number.

It is an amenable number.

242507789 is a deficient number, since it is larger than the sum of its proper divisors (1).

242507789 is an equidigital number, since it uses as much as digits as its factorization.

242507789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 282240, while the sum is 44.

The square root of 242507789 is about 15572.6615901072. The cubic root of 242507789 is about 623.6035287260.

The spelling of 242507789 in words is "two hundred forty-two million, five hundred seven thousand, seven hundred eighty-nine".