2017681 has 2 divisors, whose sum is σ = 2017682. Its totient is φ = 2017680.

The previous prime is 2017669. The next prime is 2017693. The reversal of 2017681 is 1867102.

It is a balanced prime because it is at equal distance from previous prime (2017669) and next prime (2017693).

It can be written as a sum of positive squares in only one way, i.e., 1985281 + 32400 = 1409^2 + 180^2 .

It is a cyclic number.

It is not a de Polignac number, because 2017681 - 2¹¹ = 2015633 is a prime.

It is a super-2 number, since 2×2017681² = 8142073235522, which contains 22 as substring.

2017681 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (2017601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1008840 + 1008841.

It is an arithmetic number, because the mean of its divisors is an integer number (1008841).

2^2017681 is an apocalyptic number.

It is an amenable number.

2017681 is a deficient number, since it is larger than the sum of its proper divisors (1).

2017681 is an equidigital number, since it uses as much as digits as its factorization.

2017681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 2017681 is about 1420.4509847228. The cubic root of 2017681 is about 126.3622939727.

The spelling of 2017681 in words is "two million, seventeen thousand, six hundred eighty-one".