6541 has 4 divisors (see below), whose sum is σ = 6784. Its totient is φ = 6300.

The previous prime is 6529. The next prime is 6547. The reversal of 6541 is 1456.

6541 = T₃ + T₄ + ... + T₃₃.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6541 - 2⁹ = 6029 is a prime.

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

It is a deceptive number, since it divides R₆₅₄₀.

It is a Duffinian number.

6541 is a lucky number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6547) 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, 75 + ... + 136.

It is an arithmetic number, because the mean of its divisors is an integer number (1696).

2⁶⁵⁴¹ is an apocalyptic number.

It is an amenable number.

6541 is a deficient number, since it is larger than the sum of its proper divisors (243).

6541 is a wasteful number, since it uses less digits than its factorization.

6541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242.

The product of its digits is 120, while the sum is 16.

The square root of 6541 is about 80.8764489824. The cubic root of 6541 is about 18.7017127889.

Adding to 6541 its reverse (1456), we get a palindrome (7997).

The spelling of 6541 in words is "six thousand, five hundred forty-one".