448991209 has 2 divisors, whose sum is σ = 448991210. Its totient is φ = 448991208.

The previous prime is 448991203. The next prime is 448991219. The reversal of 448991209 is 902199844.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 447195609 + 1795600 = 21147^2 + 1340^2 .

It is a cyclic number.

It is not a de Polignac number, because 448991209 - 2¹⁵ = 448958441 is a prime.

It is not a weakly prime, because it can be changed into another prime (448991203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 224495604 + 224495605.

It is an arithmetic number, because the mean of its divisors is an integer number (224495605).

Almost surely, 2^448991209 is an apocalyptic number.

It is an amenable number.

448991209 is a deficient number, since it is larger than the sum of its proper divisors (1).

448991209 is an equidigital number, since it uses as much as digits as its factorization.

448991209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 186624, while the sum is 46.

The square root of 448991209 is about 21189.4126629315. The cubic root of 448991209 is about 765.7363772530.

The spelling of 448991209 in words is "four hundred forty-eight million, nine hundred ninety-one thousand, two hundred nine".