6396581 has 2 divisors, whose sum is σ = 6396582. Its totient is φ = 6396580.

The previous prime is 6396569. The next prime is 6396583. The reversal of 6396581 is 1856936.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6076225 + 320356 = 2465^2 + 566^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6396581 is a prime.

It is a super-2 number, since 2×6396581² = 81832496979122, which contains 22 as substring.

Together with 6396583, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6396583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3198290 + 3198291.

It is an arithmetic number, because the mean of its divisors is an integer number (3198291).

Almost surely, 2^6396581 is an apocalyptic number.

It is an amenable number.

6396581 is a deficient number, since it is larger than the sum of its proper divisors (1).

6396581 is an equidigital number, since it uses as much as digits as its factorization.

6396581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38880, while the sum is 38.

The square root of 6396581 is about 2529.1462986549. The cubic root of 6396581 is about 185.6304858049.

It can be divided in two parts, 63965 and 81, that added together give a palindrome (64046).

The spelling of 6396581 in words is "six million, three hundred ninety-six thousand, five hundred eighty-one".