1028591 has 4 divisors (see below), whose sum is σ = 1038312. Its totient is φ = 1018872.

The previous prime is 1028581. The next prime is 1028597. The reversal of 1028591 is 1958201.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1028591 - 2¹⁰ = 1027567 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1028591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1028597) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4700 + ... + 4913.

It is an arithmetic number, because the mean of its divisors is an integer number (259578).

2^1028591 is an apocalyptic number.

1028591 is a deficient number, since it is larger than the sum of its proper divisors (9721).

1028591 is an equidigital number, since it uses as much as digits as its factorization.

1028591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9720.

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 1028591 is about 1014.1947544727. The cubic root of 1028591 is about 100.9440921835.

The spelling of 1028591 in words is "one million, twenty-eight thousand, five hundred ninety-one".