242731009 has 2 divisors, whose sum is σ = 242731010. Its totient is φ = 242731008.

The previous prime is 242731007. The next prime is 242731031. The reversal of 242731009 is 900137242.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 226954225 + 15776784 = 15065^2 + 3972^2 .

It is a cyclic number.

It is not a de Polignac number, because 242731009 - 2¹ = 242731007 is a prime.

Together with 242731007, it forms a pair of twin primes.

It is equal to p_13302973 and since 242731009 and 13302973 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (242731003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121365504 + 121365505.

It is an arithmetic number, because the mean of its divisors is an integer number (121365505).

Almost surely, 2^242731009 is an apocalyptic number.

It is an amenable number.

242731009 is a deficient number, since it is larger than the sum of its proper divisors (1).

242731009 is an equidigital number, since it uses as much as digits as its factorization.

242731009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 242731009 is about 15579.8269887698. The cubic root of 242731009 is about 623.7948051825.

The spelling of 242731009 in words is "two hundred forty-two million, seven hundred thirty-one thousand, nine".