6816631 has 2 divisors, whose sum is σ = 6816632. Its totient is φ = 6816630.

The previous prime is 6816629. The next prime is 6816659. The reversal of 6816631 is 1366186.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6816631 - 2¹ = 6816629 is a prime.

It is a super-2 number, since 2×6816631² = 92932916380322, which contains 22 as substring.

Together with 6816629, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 6816593 and 6816602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6816331) 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 as a sum of consecutive naturals, namely, 3408315 + 3408316.

It is an arithmetic number, because the mean of its divisors is an integer number (3408316).

Almost surely, 2^6816631 is an apocalyptic number.

6816631 is a deficient number, since it is larger than the sum of its proper divisors (1).

6816631 is an equidigital number, since it uses as much as digits as its factorization.

6816631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 31.

The square root of 6816631 is about 2610.8678633742. The cubic root of 6816631 is about 189.6079728498.

It can be divided in two parts, 6816 and 631, that added together give a palindrome (7447).

The spelling of 6816631 in words is "six million, eight hundred sixteen thousand, six hundred thirty-one".