6511649 has 2 divisors, whose sum is σ = 6511650. Its totient is φ = 6511648.

The previous prime is 6511621. The next prime is 6511669. The reversal of 6511649 is 9461156.

6511649 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4276624 + 2235025 = 2068^2 + 1495^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6511649 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6511669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3255824 + 3255825.

It is an arithmetic number, because the mean of its divisors is an integer number (3255825).

Almost surely, 2^6511649 is an apocalyptic number.

It is an amenable number.

6511649 is a deficient number, since it is larger than the sum of its proper divisors (1).

6511649 is an equidigital number, since it uses as much as digits as its factorization.

6511649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 32.

The square root of 6511649 is about 2551.7932910014. The cubic root of 6511649 is about 186.7369785434.

The spelling of 6511649 in words is "six million, five hundred eleven thousand, six hundred forty-nine".