6541565 has 4 divisors (see below), whose sum is σ = 7849884. Its totient is φ = 5233248.

The previous prime is 6541541. The next prime is 6541571. The reversal of 6541565 is 5651456.

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 3232804 + 3308761 = 1798^2 + 1819^2 .

It is a cyclic number.

It is not a de Polignac number, because 6541565 - 2⁸ = 6541309 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

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, 654152 + ... + 654161.

It is an arithmetic number, because the mean of its divisors is an integer number (1962471).

Almost surely, 2^6541565 is an apocalyptic number.

It is an amenable number.

6541565 is a deficient number, since it is larger than the sum of its proper divisors (1308319).

6541565 is a wasteful number, since it uses less digits than its factorization.

6541565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1308318.

The product of its digits is 18000, while the sum is 32.

The square root of 6541565 is about 2557.6483339193. The cubic root of 6541565 is about 187.0225124698.

The spelling of 6541565 in words is "six million, five hundred forty-one thousand, five hundred sixty-five".