849121709 has 2 divisors, whose sum is σ = 849121710. Its totient is φ = 849121708.

The previous prime is 849121703. The next prime is 849121717. The reversal of 849121709 is 907121948.

849121709 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 716365225 + 132756484 = 26765^2 + 11522^2 .

It is a cyclic number.

It is not a de Polignac number, because 849121709 - 2⁸ = 849121453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (849121703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 424560854 + 424560855.

It is an arithmetic number, because the mean of its divisors is an integer number (424560855).

Almost surely, 2^849121709 is an apocalyptic number.

It is an amenable number.

849121709 is a deficient number, since it is larger than the sum of its proper divisors (1).

849121709 is an equidigital number, since it uses as much as digits as its factorization.

849121709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 41.

The square root of 849121709 is about 29139.6930148552. The cubic root of 849121709 is about 946.9418591906.

The spelling of 849121709 in words is "eight hundred forty-nine million, one hundred twenty-one thousand, seven hundred nine".