447326821 has 2 divisors, whose sum is σ = 447326822. Its totient is φ = 447326820.

The previous prime is 447326819. The next prime is 447326833. The reversal of 447326821 is 128623744.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 443944900 + 3381921 = 21070^2 + 1839^2 .

It is a cyclic number.

It is not a de Polignac number, because 447326821 - 2¹ = 447326819 is a prime.

Together with 447326819, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (447326021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 223663410 + 223663411.

It is an arithmetic number, because the mean of its divisors is an integer number (223663411).

Almost surely, 2^447326821 is an apocalyptic number.

It is an amenable number.

447326821 is a deficient number, since it is larger than the sum of its proper divisors (1).

447326821 is an equidigital number, since it uses as much as digits as its factorization.

447326821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64512, while the sum is 37.

The square root of 447326821 is about 21150.1021510535. The cubic root of 447326821 is about 764.7890235132.

The spelling of 447326821 in words is "four hundred forty-seven million, three hundred twenty-six thousand, eight hundred twenty-one".