6513649 has 2 divisors, whose sum is σ = 6513650. Its totient is φ = 6513648.

The previous prime is 6513613. The next prime is 6513653. The reversal of 6513649 is 9463156.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3873024 + 2640625 = 1968^2 + 1625^2 .

It is a cyclic number.

It is not a de Polignac number, because 6513649 - 2¹¹ = 6511601 is a prime.

6513649 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (6510649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3256824 + 3256825.

It is an arithmetic number, because the mean of its divisors is an integer number (3256825).

Almost surely, 2^6513649 is an apocalyptic number.

It is an amenable number.

6513649 is a deficient number, since it is larger than the sum of its proper divisors (1).

6513649 is an equidigital number, since it uses as much as digits as its factorization.

6513649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 34.

The square root of 6513649 is about 2552.1851421870. The cubic root of 6513649 is about 186.7560948342.

The spelling of 6513649 in words is "six million, five hundred thirteen thousand, six hundred forty-nine".