2009448989 has 2 divisors, whose sum is σ = 2009448990. Its totient is φ = 2009448988.

The previous prime is 2009448983. The next prime is 2009449003. The reversal of 2009448989 is 9898449002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1961604100 + 47844889 = 44290^2 + 6917^2 .

It is a cyclic number.

It is not a de Polignac number, because 2009448989 - 2²⁴ = 1992671773 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2009448989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2009448983) 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, 1004724494 + 1004724495.

It is an arithmetic number, because the mean of its divisors is an integer number (1004724495).

Almost surely, 2^2009448989 is an apocalyptic number.

It is an amenable number.

2009448989 is a deficient number, since it is larger than the sum of its proper divisors (1).

2009448989 is an equidigital number, since it uses as much as digits as its factorization.

2009448989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1492992, while the sum is 53.

The square root of 2009448989 is about 44826.8779751613. The cubic root of 2009448989 is about 1261.9020967046.

The spelling of 2009448989 in words is "two billion, nine million, four hundred forty-eight thousand, nine hundred eighty-nine".