6394981 has 2 divisors, whose sum is σ = 6394982. Its totient is φ = 6394980.

The previous prime is 6394967. The next prime is 6395047. The reversal of 6394981 is 1894936.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4990756 + 1404225 = 2234^2 + 1185^2 .

It is a cyclic number.

It is not a de Polignac number, because 6394981 - 2⁷ = 6394853 is a prime.

It is a super-2 number, since 2×6394981² = 81791563980722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6394481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3197490 + 3197491.

It is an arithmetic number, because the mean of its divisors is an integer number (3197491).

Almost surely, 2^6394981 is an apocalyptic number.

It is an amenable number.

6394981 is a deficient number, since it is larger than the sum of its proper divisors (1).

6394981 is an equidigital number, since it uses as much as digits as its factorization.

6394981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 40.

The square root of 6394981 is about 2528.8299666051. The cubic root of 6394981 is about 185.6150070387.

The spelling of 6394981 in words is "six million, three hundred ninety-four thousand, nine hundred eighty-one".