242005909 has 2 divisors, whose sum is σ = 242005910. Its totient is φ = 242005908.

The previous prime is 242005891. The next prime is 242005919. The reversal of 242005909 is 909500242.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 224550225 + 17455684 = 14985^2 + 4178^2 .

It is a cyclic number.

It is not a de Polignac number, because 242005909 - 2¹⁵ = 241973141 is a prime.

It is equal to p_13265581 and since 242005909 and 13265581 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (242005919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121002954 + 121002955.

It is an arithmetic number, because the mean of its divisors is an integer number (121002955).

Almost surely, 2^242005909 is an apocalyptic number.

It is an amenable number.

242005909 is a deficient number, since it is larger than the sum of its proper divisors (1).

242005909 is an equidigital number, since it uses as much as digits as its factorization.

242005909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 242005909 is about 15556.5391073979. The cubic root of 242005909 is about 623.1730404336.

The spelling of 242005909 in words is "two hundred forty-two million, five thousand, nine hundred nine".