242545004209 has 2 divisors, whose sum is σ = 242545004210. Its totient is φ = 242545004208.

The previous prime is 242545004173. The next prime is 242545004239. The reversal of 242545004209 is 902400545242.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 223653326400 + 18891677809 = 472920^2 + 137447^2 .

It is a cyclic number.

It is not a de Polignac number, because 242545004209 - 2⁹ = 242545003697 is a prime.

It is not a weakly prime, because it can be changed into another prime (242545004239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121272502104 + 121272502105.

It is an arithmetic number, because the mean of its divisors is an integer number (121272502105).

Almost surely, 2^242545004209 is an apocalyptic number.

It is an amenable number.

242545004209 is a deficient number, since it is larger than the sum of its proper divisors (1).

242545004209 is an equidigital number, since it uses as much as digits as its factorization.

242545004209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 115200, while the sum is 37.

The spelling of 242545004209 in words is "two hundred forty-two billion, five hundred forty-five million, four thousand, two hundred nine".