304224721 has 2 divisors, whose sum is σ = 304224722. Its totient is φ = 304224720.

The previous prime is 304224691. The next prime is 304224733. The reversal of 304224721 is 127422403.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 159744321 + 144480400 = 12639^2 + 12020^2 .

It is a cyclic number.

It is not a de Polignac number, because 304224721 - 2²³ = 295836113 is a prime.

It is not a weakly prime, because it can be changed into another prime (304224121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152112360 + 152112361.

It is an arithmetic number, because the mean of its divisors is an integer number (152112361).

Almost surely, 2^304224721 is an apocalyptic number.

It is an amenable number.

304224721 is a deficient number, since it is larger than the sum of its proper divisors (1).

304224721 is an equidigital number, since it uses as much as digits as its factorization.

304224721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 25.

The square root of 304224721 is about 17442.0389003121. The cubic root of 304224721 is about 672.5607217965.

The spelling of 304224721 in words is "three hundred four million, two hundred twenty-four thousand, seven hundred twenty-one".