6805649 has 2 divisors, whose sum is σ = 6805650. Its totient is φ = 6805648.

The previous prime is 6805639. The next prime is 6805663. The reversal of 6805649 is 9465086.

6805649 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., 5382400 + 1423249 = 2320^2 + 1193^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6805649 is a prime.

It is a super-2 number, since 2×6805649² = 92633716622402, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6805609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3402824 + 3402825.

It is an arithmetic number, because the mean of its divisors is an integer number (3402825).

Almost surely, 2^6805649 is an apocalyptic number.

It is an amenable number.

6805649 is a deficient number, since it is larger than the sum of its proper divisors (1).

6805649 is an equidigital number, since it uses as much as digits as its factorization.

6805649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 6805649 is about 2608.7638835280. The cubic root of 6805649 is about 189.5060948604.

The spelling of 6805649 in words is "six million, eight hundred five thousand, six hundred forty-nine".