6449 has 2 divisors, whose sum is σ = 6450. Its totient is φ = 6448.

The previous prime is 6427. The next prime is 6451. The reversal of 6449 is 9446.

6449 is nontrivially palindromic in base 7.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6400 + 49 = 80^2 + 7^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6449 is a prime.

It is a Sophie Germain prime.

Together with 6451, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a nialpdrome in base 9.

It is not a weakly prime, because it can be changed into another prime (6469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3224 + 3225.

It is an arithmetic number, because the mean of its divisors is an integer number (3225).

2⁶⁴⁴⁹ is an apocalyptic number.

It is an amenable number.

6449 is a deficient number, since it is larger than the sum of its proper divisors (1).

6449 is an equidigital number, since it uses as much as digits as its factorization.

6449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 23.

The square root of 6449 is about 80.3056660517. The cubic root of 6449 is about 18.6136178071.

It can be divided in two parts, 64 and 49, that multiplied together give a square (3136 = 56²).

The spelling of 6449 in words is "six thousand, four hundred forty-nine".