447221989 has 2 divisors, whose sum is σ = 447221990. Its totient is φ = 447221988.

The previous prime is 447221977. The next prime is 447222037. The reversal of 447221989 is 989122744.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 445421025 + 1800964 = 21105^2 + 1342^2 .

It is a cyclic number.

It is not a de Polignac number, because 447221989 - 2⁹ = 447221477 is a prime.

It is a super-2 number, since 2×447221989² = 400015014890232242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (447221939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 223610994 + 223610995.

It is an arithmetic number, because the mean of its divisors is an integer number (223610995).

Almost surely, 2^447221989 is an apocalyptic number.

It is an amenable number.

447221989 is a deficient number, since it is larger than the sum of its proper divisors (1).

447221989 is an equidigital number, since it uses as much as digits as its factorization.

447221989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 46.

The square root of 447221989 is about 21147.6237199360. The cubic root of 447221989 is about 764.7292755295.

The spelling of 447221989 in words is "four hundred forty-seven million, two hundred twenty-one thousand, nine hundred eighty-nine".