6543643 has 2 divisors, whose sum is σ = 6543644. Its totient is φ = 6543642.

The previous prime is 6543629. The next prime is 6543659. The reversal of 6543643 is 3463456.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6543643 is a prime.

It is a super-2 number, since 2×6543643² = 85638527422898, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6543613) 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 as a sum of consecutive naturals, namely, 3271821 + 3271822.

It is an arithmetic number, because the mean of its divisors is an integer number (3271822).

Almost surely, 2^6543643 is an apocalyptic number.

6543643 is a deficient number, since it is larger than the sum of its proper divisors (1).

6543643 is an equidigital number, since it uses as much as digits as its factorization.

6543643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 31.

The square root of 6543643 is about 2558.0545342115. The cubic root of 6543643 is about 187.0423136253.

The spelling of 6543643 in words is "six million, five hundred forty-three thousand, six hundred forty-three".