6543631 has 4 divisors (see below), whose sum is σ = 6654600. Its totient is φ = 6432664.

The previous prime is 6543629. The next prime is 6543643. The reversal of 6543631 is 1363456.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6543631 - 2¹ = 6543629 is a prime.

It is a super-2 number, since 2×6543631² = 85638213328322, which contains 22 as substring.

It is a Duffinian number.

6543631 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 6543631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6543671) 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 in 3 ways as a sum of consecutive naturals, for example, 55396 + ... + 55513.

It is an arithmetic number, because the mean of its divisors is an integer number (1663650).

Almost surely, 2^6543631 is an apocalyptic number.

6543631 is a deficient number, since it is larger than the sum of its proper divisors (110969).

6543631 is a wasteful number, since it uses less digits than its factorization.

6543631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110968.

The product of its digits is 6480, while the sum is 28.

The square root of 6543631 is about 2558.0521886779. The cubic root of 6543631 is about 187.0421992899.

The spelling of 6543631 in words is "six million, five hundred forty-three thousand, six hundred thirty-one".