6499 has 4 divisors (see below), whose sum is σ = 6664. Its totient is φ = 6336.

The previous prime is 6491. The next prime is 6521. The reversal of 6499 is 9946.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9946 = 2 ⋅4973.

It is a cyclic number.

It is not a de Polignac number, because 6499 - 2³ = 6491 is a prime.

It is a Duffinian number.

6499 is a modest number, since divided by 99 gives 64 as remainder.

It is a nialpdrome in base 9.

It is not an unprimeable number, because it can be changed into a prime (6491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19 + ... + 115.

It is an arithmetic number, because the mean of its divisors is an integer number (1666).

6499 is a deficient number, since it is larger than the sum of its proper divisors (165).

6499 is an equidigital number, since it uses as much as digits as its factorization.

6499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164.

The product of its digits is 1944, while the sum is 28.

The square root of 6499 is about 80.6163755077. The cubic root of 6499 is about 18.6615986809.

It can be divided in two parts, 64 and 99, that multiplied together give a palindrome (6336).

The spelling of 6499 in words is "six thousand, four hundred ninety-nine".