1020689 has 2 divisors, whose sum is σ = 1020690. Its totient is φ = 1020688.

The previous prime is 1020683. The next prime is 1020707. The reversal of 1020689 is 9860201.

1020689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 640000 + 380689 = 800^2 + 617^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020689 - 2¹⁶ = 955153 is a prime.

It is a nialpdrome in base 16.

It is not a weakly prime, because it can be changed into another prime (1020683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510344 + 510345.

It is an arithmetic number, because the mean of its divisors is an integer number (510345).

2^1020689 is an apocalyptic number.

It is an amenable number.

1020689 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020689 is an equidigital number, since it uses as much as digits as its factorization.

1020689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 1020689 is about 1010.2915420808. The cubic root of 1020689 is about 100.6849313135.

The spelling of 1020689 in words is "one million, twenty thousand, six hundred eighty-nine".