6543681 has 4 divisors (see below), whose sum is σ = 8724912. Its totient is φ = 4362452.

The previous prime is 6543679. The next prime is 6543683. The reversal of 6543681 is 1863456.

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 an interprime number because it is at equal distance from previous prime (6543679) and next prime (6543683).

It is a cyclic number.

It is not a de Polignac number, because 6543681 - 2¹ = 6543679 is a prime.

It is a super-2 number, since 2×6543681² = 85639522059522, which contains 22 as substring.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (6543683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1090611 + ... + 1090616.

It is an arithmetic number, because the mean of its divisors is an integer number (2181228).

Almost surely, 2^6543681 is an apocalyptic number.

It is an amenable number.

6543681 is a deficient number, since it is larger than the sum of its proper divisors (2181231).

6543681 is a wasteful number, since it uses less digits than its factorization.

6543681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2181230.

The product of its digits is 17280, while the sum is 33.

The square root of 6543681 is about 2558.0619617202. The cubic root of 6543681 is about 187.0426756863.

The spelling of 6543681 in words is "six million, five hundred forty-three thousand, six hundred eighty-one".