849439009 has 2 divisors, whose sum is σ = 849439010. Its totient is φ = 849439008.

The previous prime is 849439001. The next prime is 849439027. The reversal of 849439009 is 900934948.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 770229009 + 79210000 = 27753^2 + 8900^2 .

It is a cyclic number.

It is not a de Polignac number, because 849439009 - 2³ = 849439001 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 849439009.

It is not a weakly prime, because it can be changed into another prime (849439001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 424719504 + 424719505.

It is an arithmetic number, because the mean of its divisors is an integer number (424719505).

Almost surely, 2^849439009 is an apocalyptic number.

It is an amenable number.

849439009 is a deficient number, since it is larger than the sum of its proper divisors (1).

849439009 is an equidigital number, since it uses as much as digits as its factorization.

849439009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 279936, while the sum is 46.

The square root of 849439009 is about 29145.1369699990. The cubic root of 849439009 is about 947.0597956539.

The spelling of 849439009 in words is "eight hundred forty-nine million, four hundred thirty-nine thousand, nine".