6849887221 has 2 divisors, whose sum is σ = 6849887222. Its totient is φ = 6849887220.

The previous prime is 6849887173. The next prime is 6849887227. The reversal of 6849887221 is 1227889486.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6849383121 + 504100 = 82761^2 + 710^2 .

It is a cyclic number.

It is not a de Polignac number, because 6849887221 - 2¹⁷ = 6849756149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6849887227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3424943610 + 3424943611.

It is an arithmetic number, because the mean of its divisors is an integer number (3424943611).

Almost surely, 2^6849887221 is an apocalyptic number.

It is an amenable number.

6849887221 is a deficient number, since it is larger than the sum of its proper divisors (1).

6849887221 is an equidigital number, since it uses as much as digits as its factorization.

6849887221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3096576, while the sum is 55.

The square root of 6849887221 is about 82764.0454605742. The cubic root of 6849887221 is about 1899.1581885791.

The spelling of 6849887221 in words is "six billion, eight hundred forty-nine million, eight hundred eighty-seven thousand, two hundred twenty-one".