6400543 has 2 divisors, whose sum is σ = 6400544. Its totient is φ = 6400542.

The previous prime is 6400531. The next prime is 6400591. The reversal of 6400543 is 3450046.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6400543 - 2²¹ = 4303391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6400843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3200271 + 3200272.

It is an arithmetic number, because the mean of its divisors is an integer number (3200272).

Almost surely, 2^6400543 is an apocalyptic number.

6400543 is a deficient number, since it is larger than the sum of its proper divisors (1).

6400543 is an equidigital number, since it uses as much as digits as its factorization.

6400543 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 6400543 is about 2529.9294456565. The cubic root of 6400543 is about 185.6688039934.

Adding to 6400543 its reverse (3450046), we get a palindrome (9850589).

The spelling of 6400543 in words is "six million, four hundred thousand, five hundred forty-three".