849808889 has 2 divisors, whose sum is σ = 849808890. Its totient is φ = 849808888.

The previous prime is 849808847. The next prime is 849808891. The reversal of 849808889 is 988808948.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 520204864 + 329604025 = 22808^2 + 18155^2 .

It is a cyclic number.

It is not a de Polignac number, because 849808889 - 2¹² = 849804793 is a prime.

Together with 849808891, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (849808819) 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, 424904444 + 424904445.

It is an arithmetic number, because the mean of its divisors is an integer number (424904445).

Almost surely, 2^849808889 is an apocalyptic number.

It is an amenable number.

849808889 is a deficient number, since it is larger than the sum of its proper divisors (1).

849808889 is an equidigital number, since it uses as much as digits as its factorization.

849808889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10616832, while the sum is 62.

The square root of 849808889 is about 29151.4817633684. The cubic root of 849808889 is about 947.1972383822.

The spelling of 849808889 in words is "eight hundred forty-nine million, eight hundred eight thousand, eight hundred eighty-nine".