1028561 has 2 divisors, whose sum is σ = 1028562. Its totient is φ = 1028560.

The previous prime is 1028557. The next prime is 1028569. The reversal of 1028561 is 1658201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1000000 + 28561 = 1000^2 + 169^2 .

It is an emirp because it is prime and its reverse (1658201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1028561 - 2² = 1028557 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1028569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 514280 + 514281.

It is an arithmetic number, because the mean of its divisors is an integer number (514281).

2^1028561 is an apocalyptic number.

It is an amenable number.

1028561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1028561 is an equidigital number, since it uses as much as digits as its factorization.

1028561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 1028561 is about 1014.1799643061. The cubic root of 1028561 is about 100.9431107918.

The spelling of 1028561 in words is "one million, twenty-eight thousand, five hundred sixty-one".