1028551 has 6 divisors (see below), whose sum is σ = 1092920. Its totient is φ = 967776.

The previous prime is 1028509. The next prime is 1028557. The reversal of 1028551 is 1558201.

It is not a de Polignac number, because 1028551 - 2¹⁵ = 995783 is a prime.

It is a Duffinian number.

1028551 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1028557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1491 + ... + 2068.

2^1028551 is an apocalyptic number.

1028551 is a deficient number, since it is larger than the sum of its proper divisors (64369).

1028551 is an equidigital number, since it uses as much as digits as its factorization.

1028551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3593 (or 3576 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 22.

The square root of 1028551 is about 1014.1750342027. The cubic root of 1028551 is about 100.9427836569.

It can be divided in two parts, 10 and 28551, that added together give a 4-th power (28561 = 13⁴).

The spelling of 1028551 in words is "one million, twenty-eight thousand, five hundred fifty-one".