849241909 has 2 divisors, whose sum is σ = 849241910. Its totient is φ = 849241908.

The previous prime is 849241907. The next prime is 849241933. The reversal of 849241909 is 909142948.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 568679409 + 280562500 = 23847^2 + 16750^2 .

It is a cyclic number.

It is not a de Polignac number, because 849241909 - 2¹ = 849241907 is a prime.

Together with 849241907, 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 (849241907) 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, 424620954 + 424620955.

It is an arithmetic number, because the mean of its divisors is an integer number (424620955).

Almost surely, 2^849241909 is an apocalyptic number.

It is an amenable number.

849241909 is a deficient number, since it is larger than the sum of its proper divisors (1).

849241909 is an equidigital number, since it uses as much as digits as its factorization.

849241909 is an odious number, because the sum of its binary digits is odd.

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

The square root of 849241909 is about 29141.7554207018. The cubic root of 849241909 is about 946.9865394918.

The spelling of 849241909 in words is "eight hundred forty-nine million, two hundred forty-one thousand, nine hundred nine".