6205981 has 4 divisors (see below), whose sum is σ = 6210972. Its totient is φ = 6200992.

The previous prime is 6205967. The next prime is 6206017. The reversal of 6205981 is 1895026.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1071225 + 5134756 = 1035^2 + 2266^2 .

It is a cyclic number.

It is not a de Polignac number, because 6205981 - 2¹⁷ = 6074909 is a prime.

It is a super-2 number, since 2×6205981² = 77028400344722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6205931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1041 + ... + 3673.

It is an arithmetic number, because the mean of its divisors is an integer number (1552743).

Almost surely, 2^6205981 is an apocalyptic number.

It is an amenable number.

6205981 is a deficient number, since it is larger than the sum of its proper divisors (4991).

6205981 is a wasteful number, since it uses less digits than its factorization.

6205981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4990.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 6205981 is about 2491.1806437912. The cubic root of 6205981 is about 183.7681093417.

The spelling of 6205981 in words is "six million, two hundred five thousand, nine hundred eighty-one".