2162681 has 2 divisors, whose sum is σ = 2162682. Its totient is φ = 2162680.

The previous prime is 2162663. The next prime is 2162717. The reversal of 2162681 is 1862612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1585081 + 577600 = 1259^2 + 760^2 .

It is a cyclic number.

It is not a de Polignac number, because 2162681 - 2¹⁸ = 1900537 is a prime.

It is a super-2 number, since 2×2162681² = 9354378215522, 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 2162681.

It is not a weakly prime, because it can be changed into another prime (2162651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1081340 + 1081341.

It is an arithmetic number, because the mean of its divisors is an integer number (1081341).

2^2162681 is an apocalyptic number.

It is an amenable number.

2162681 is a deficient number, since it is larger than the sum of its proper divisors (1).

2162681 is an equidigital number, since it uses as much as digits as its factorization.

2162681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 26.

The square root of 2162681 is about 1470.6056575439. The cubic root of 2162681 is about 129.3195411362.

The spelling of 2162681 in words is "two million, one hundred sixty-two thousand, six hundred eighty-one".