6499649 has 4 divisors (see below), whose sum is σ = 6999636. Its totient is φ = 5999664.

The previous prime is 6499637. The next prime is 6499651. The reversal of 6499649 is 9469946.

6499649 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3489424 + 3010225 = 1868^2 + 1735^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6499649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6499699) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 249974 + ... + 249999.

It is an arithmetic number, because the mean of its divisors is an integer number (1749909).

Almost surely, 2^6499649 is an apocalyptic number.

It is an amenable number.

6499649 is a deficient number, since it is larger than the sum of its proper divisors (499987).

6499649 is a wasteful number, since it uses less digits than its factorization.

6499649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499986.

The product of its digits is 419904, while the sum is 47.

The square root of 6499649 is about 2549.4409191036. The cubic root of 6499649 is about 186.6221985204.

The spelling of 6499649 in words is "six million, four hundred ninety-nine thousand, six hundred forty-nine".