849221 has 2 divisors, whose sum is σ = 849222. Its totient is φ = 849220.

The previous prime is 849217. The next prime is 849223. The reversal of 849221 is 122948.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 792100 + 57121 = 890^2 + 239^2 .

It is a cyclic number.

It is not a de Polignac number, because 849221 - 2² = 849217 is a prime.

Together with 849223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (849223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 424610 + 424611.

It is an arithmetic number, because the mean of its divisors is an integer number (424611).

2⁸⁴⁹²²¹ is an apocalyptic number.

It is an amenable number.

849221 is a deficient number, since it is larger than the sum of its proper divisors (1).

849221 is an equidigital number, since it uses as much as digits as its factorization.

849221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 26.

The square root of 849221 is about 921.5318768225. The cubic root of 849221 is about 94.6978767578.

The spelling of 849221 in words is "eight hundred forty-nine thousand, two hundred twenty-one".