1028975408891 has 4 divisors (see below), whose sum is σ = 1028986264152. Its totient is φ = 1028964553632.

The previous prime is 1028975408869. The next prime is 1028975408963. The reversal of 1028975408891 is 1988045798201.

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 1028975408891 - 2⁶ = 1028975408827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1028975408801) 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, 5284181 + ... + 5475446.

It is an arithmetic number, because the mean of its divisors is an integer number (257246566038).

Almost surely, 2^{1028975408891} is an apocalyptic number.

1028975408891 is a deficient number, since it is larger than the sum of its proper divisors (10855261).

1028975408891 is an equidigital number, since it uses as much as digits as its factorization.

1028975408891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10855260.

The product of its (nonzero) digits is 11612160, while the sum is 62.

The spelling of 1028975408891 in words is "one trillion, twenty-eight billion, nine hundred seventy-five million, four hundred eight thousand, eight hundred ninety-one".