2168081 has 2 divisors, whose sum is σ = 2168082. Its totient is φ = 2168080.

The previous prime is 2168059. The next prime is 2168093. The reversal of 2168081 is 1808612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2131600 + 36481 = 1460^2 + 191^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2168081 is a prime.

It is a super-2 number, since 2×2168081² = 9401150445122, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2168081.

It is not a weakly prime, because it can be changed into another prime (2168021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1084040 + 1084041.

It is an arithmetic number, because the mean of its divisors is an integer number (1084041).

2^2168081 is an apocalyptic number.

It is an amenable number.

2168081 is a deficient number, since it is larger than the sum of its proper divisors (1).

2168081 is an equidigital number, since it uses as much as digits as its factorization.

2168081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 26.

The square root of 2168081 is about 1472.4404911575. The cubic root of 2168081 is about 129.4270843677.

The spelling of 2168081 in words is "two million, one hundred sixty-eight thousand, eighty-one".