450317221 has 2 divisors, whose sum is σ = 450317222. Its totient is φ = 450317220.

The previous prime is 450317209. The next prime is 450317237. The reversal of 450317221 is 122713054.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 422754721 + 27562500 = 20561^2 + 5250^2 .

It is a cyclic number.

It is not a de Polignac number, because 450317221 - 2⁹ = 450316709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (450317821) 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, 225158610 + 225158611.

It is an arithmetic number, because the mean of its divisors is an integer number (225158611).

Almost surely, 2^450317221 is an apocalyptic number.

It is an amenable number.

450317221 is a deficient number, since it is larger than the sum of its proper divisors (1).

450317221 is an equidigital number, since it uses as much as digits as its factorization.

450317221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 450317221 is about 21220.6790890395. The cubic root of 450317221 is about 766.4894563536.

The spelling of 450317221 in words is "four hundred fifty million, three hundred seventeen thousand, two hundred twenty-one".