6395981 has 2 divisors, whose sum is σ = 6395982. Its totient is φ = 6395980.

The previous prime is 6395971. The next prime is 6396053. The reversal of 6395981 is 1895936.

6395981 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6325225 + 70756 = 2515^2 + 266^2 .

It is a cyclic number.

It is not a de Polignac number, because 6395981 - 2¹⁰ = 6394957 is a prime.

It is a super-2 number, since 2×6395981² = 81817145904722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6395941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3197990 + 3197991.

It is an arithmetic number, because the mean of its divisors is an integer number (3197991).

Almost surely, 2^6395981 is an apocalyptic number.

It is an amenable number.

6395981 is a deficient number, since it is larger than the sum of its proper divisors (1).

6395981 is an equidigital number, since it uses as much as digits as its factorization.

6395981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58320, while the sum is 41.

The square root of 6395981 is about 2529.0276787730. The cubic root of 6395981 is about 185.6246815701.

The spelling of 6395981 in words is "six million, three hundred ninety-five thousand, nine hundred eighty-one".