6543403 has 2 divisors, whose sum is σ = 6543404. Its totient is φ = 6543402.

The previous prime is 6543389. The next prime is 6543443. The reversal of 6543403 is 3043456.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6543403 is a prime.

It is a super-2 number, since 2×6543403² = 85632245640818, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6543443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3271701 + 3271702.

It is an arithmetic number, because the mean of its divisors is an integer number (3271702).

Almost surely, 2^6543403 is an apocalyptic number.

6543403 is a deficient number, since it is larger than the sum of its proper divisors (1).

6543403 is an equidigital number, since it uses as much as digits as its factorization.

6543403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 25.

The square root of 6543403 is about 2558.0076231317. The cubic root of 6543403 is about 187.0400268917.

Adding to 6543403 its reverse (3043456), we get a palindrome (9586859).

The spelling of 6543403 in words is "six million, five hundred forty-three thousand, four hundred three".