304240561 has 2 divisors, whose sum is σ = 304240562. Its totient is φ = 304240560.

The previous prime is 304240549. The next prime is 304240577. The reversal of 304240561 is 165042403.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 247086961 + 57153600 = 15719^2 + 7560^2 .

It is a cyclic number.

It is not a de Polignac number, because 304240561 - 2¹¹ = 304238513 is a prime.

It is not a weakly prime, because it can be changed into another prime (304240591) 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, 152120280 + 152120281.

It is an arithmetic number, because the mean of its divisors is an integer number (152120281).

Almost surely, 2^304240561 is an apocalyptic number.

It is an amenable number.

304240561 is a deficient number, since it is larger than the sum of its proper divisors (1).

304240561 is an equidigital number, since it uses as much as digits as its factorization.

304240561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 304240561 is about 17442.4929697564. The cubic root of 304240561 is about 672.5723942831.

Adding to 304240561 its reverse (165042403), we get a palindrome (469282964).

The spelling of 304240561 in words is "three hundred four million, two hundred forty thousand, five hundred sixty-one".