6541661 has 4 divisors (see below), whose sum is σ = 7476192. Its totient is φ = 5607132.

The previous prime is 6541621. The next prime is 6541663. The reversal of 6541661 is 1661456.

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 6541661 - 2⁶ = 6541597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6541663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 467255 + ... + 467268.

It is an arithmetic number, because the mean of its divisors is an integer number (1869048).

Almost surely, 2^6541661 is an apocalyptic number.

It is an amenable number.

6541661 is a deficient number, since it is larger than the sum of its proper divisors (934531).

6541661 is an equidigital number, since it uses as much as digits as its factorization.

6541661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 934530.

The product of its digits is 4320, while the sum is 29.

The square root of 6541661 is about 2557.6671010904. The cubic root of 6541661 is about 187.0234273412.

The spelling of 6541661 in words is "six million, five hundred forty-one thousand, six hundred sixty-one".