6771649 has 2 divisors, whose sum is σ = 6771650. Its totient is φ = 6771648.

The previous prime is 6771641. The next prime is 6771673. The reversal of 6771649 is 9461776.

6771649 is digitally balanced in base 3, 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., 6091024 + 680625 = 2468^2 + 825^2 .

It is a cyclic number.

It is not a de Polignac number, because 6771649 - 2³ = 6771641 is a prime.

6771649 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (6771641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3385824 + 3385825.

It is an arithmetic number, because the mean of its divisors is an integer number (3385825).

Almost surely, 2^6771649 is an apocalyptic number.

It is an amenable number.

6771649 is a deficient number, since it is larger than the sum of its proper divisors (1).

6771649 is an equidigital number, since it uses as much as digits as its factorization.

6771649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63504, while the sum is 40.

The square root of 6771649 is about 2602.2392280496. The cubic root of 6771649 is about 189.1899865377.

The spelling of 6771649 in words is "six million, seven hundred seventy-one thousand, six hundred forty-nine".