6515 has 4 divisors (see below), whose sum is σ = 7824. Its totient is φ = 5208.

The previous prime is 6491. The next prime is 6521. The reversal of 6515 is 5156.

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

It is a cyclic number.

It is not a de Polignac number, because 6515 - 2⁶ = 6451 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6493 and 6502.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 647 + ... + 656.

It is an arithmetic number, because the mean of its divisors is an integer number (1956).

2⁶⁵¹⁵ is an apocalyptic number.

6515 is a deficient number, since it is larger than the sum of its proper divisors (1309).

6515 is a wasteful number, since it uses less digits than its factorization.

6515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1308.

The product of its digits is 150, while the sum is 17.

The square root of 6515 is about 80.7155499269. The cubic root of 6515 is about 18.6769005674.

It can be divided in two parts, 651 and 5, that added together give a palindrome (656).

The spelling of 6515 in words is "six thousand, five hundred fifteen".