63447221 has 2 divisors, whose sum is σ = 63447222. Its totient is φ = 63447220.

The previous prime is 63447211. The next prime is 63447239. The reversal of 63447221 is 12274436.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35832196 + 27615025 = 5986^2 + 5255^2 .

It is a cyclic number.

It is not a de Polignac number, because 63447221 - 2¹⁰ = 63446197 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63447211) 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, 31723610 + 31723611.

It is an arithmetic number, because the mean of its divisors is an integer number (31723611).

Almost surely, 2^63447221 is an apocalyptic number.

It is an amenable number.

63447221 is a deficient number, since it is larger than the sum of its proper divisors (1).

63447221 is an equidigital number, since it uses as much as digits as its factorization.

63447221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 29.

The square root of 63447221 is about 7965.3763878426. The cubic root of 63447221 is about 398.8450454932.

The spelling of 63447221 in words is "sixty-three million, four hundred forty-seven thousand, two hundred twenty-one".