6543641 has 8 divisors (see below), whose sum is σ = 7219464. Its totient is φ = 5892480.

The previous prime is 6543629. The next prime is 6543643. The reversal of 6543641 is 1463456.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 687241 + 5856400 = 829^2 + 2420^2 .

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 6543641 - 2⁶ = 6543577 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 (6543643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5606 + ... + 6671.

It is an arithmetic number, because the mean of its divisors is an integer number (902433).

Almost surely, 2^6543641 is an apocalyptic number.

It is an amenable number.

6543641 is a deficient number, since it is larger than the sum of its proper divisors (675823).

6543641 is a wasteful number, since it uses less digits than its factorization.

6543641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12331.

The product of its digits is 8640, while the sum is 29.

The square root of 6543641 is about 2558.0541432894. The cubic root of 6543641 is about 187.0422945694.

The spelling of 6543641 in words is "six million, five hundred forty-three thousand, six hundred forty-one".