6367981 has 2 divisors, whose sum is σ = 6367982. Its totient is φ = 6367980.

The previous prime is 6367967. The next prime is 6367993. The reversal of 6367981 is 1897636.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6295081 + 72900 = 2509^2 + 270^2 .

It is a cyclic number.

It is not a de Polignac number, because 6367981 - 2⁷ = 6367853 is a prime.

It is a super-2 number, since 2×6367981² = 81102364032722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6367901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3183990 + 3183991.

It is an arithmetic number, because the mean of its divisors is an integer number (3183991).

Almost surely, 2^6367981 is an apocalyptic number.

It is an amenable number.

6367981 is a deficient number, since it is larger than the sum of its proper divisors (1).

6367981 is an equidigital number, since it uses as much as digits as its factorization.

6367981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 40.

The square root of 6367981 is about 2523.4858826631. The cubic root of 6367981 is about 185.3534125747.

The spelling of 6367981 in words is "six million, three hundred sixty-seven thousand, nine hundred eighty-one".