6501 has 8 divisors (see below), whose sum is σ = 9504. Its totient is φ = 3920.

The previous prime is 6491. The next prime is 6521. The reversal of 6501 is 1056.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6501 - 2⁵ = 6469 is a prime.

It is an alternating number because its digits alternate between even and odd.

6501 is an undulating number in base 14.

It is a Curzon number.

6501 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6521) 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 7 ways as a sum of consecutive naturals, for example, 66 + ... + 131.

It is an arithmetic number, because the mean of its divisors is an integer number (1188).

2⁶⁵⁰¹ is an apocalyptic number.

6501 is the 66-th pentagonal number.

It is an amenable number.

6501 is a deficient number, since it is larger than the sum of its proper divisors (3003).

6501 is a wasteful number, since it uses less digits than its factorization.

6501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211.

The product of its (nonzero) digits is 30, while the sum is 12.

The square root of 6501 is about 80.6287789812. The cubic root of 6501 is about 18.6635127892.

Adding to 6501 its reverse (1056), we get a palindrome (7557).

Subtracting from 6501 its reverse (1056), we obtain a palindrome (5445).

The spelling of 6501 in words is "six thousand, five hundred one".