1028681 has 2 divisors, whose sum is σ = 1028682. Its totient is φ = 1028680.

The previous prime is 1028669. The next prime is 1028683. The reversal of 1028681 is 1868201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 855625 + 173056 = 925^2 + 416^2 .

It is an emirp because it is prime and its reverse (1868201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1028681 - 2⁶ = 1028617 is a prime.

It is a super-2 number, since 2×1028681² = 2116369199522, which contains 22 as substring.

Together with 1028683, it forms a pair of twin primes.

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 1028681.

It is not a weakly prime, because it can be changed into another prime (1028683) 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, 514340 + 514341.

It is an arithmetic number, because the mean of its divisors is an integer number (514341).

2^1028681 is an apocalyptic number.

It is an amenable number.

1028681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1028681 is an equidigital number, since it uses as much as digits as its factorization.

1028681 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 1028681 is about 1014.2391236784. The cubic root of 1028681 is about 100.9470362443.

The spelling of 1028681 in words is "one million, twenty-eight thousand, six hundred eighty-one".