1128944885 has 4 divisors (see below), whose sum is σ = 1354733868. Its totient is φ = 903155904.

The previous prime is 1128944837. The next prime is 1128944897. The reversal of 1128944885 is 5884498211.

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

It can be written as a sum of positive squares in 2 ways, for example, as 492795601 + 636149284 = 22199^2 + 25222^2 .

It is a cyclic number.

It is not a de Polignac number, because 1128944885 - 2¹⁰ = 1128943861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112894484 + ... + 112894493.

It is an arithmetic number, because the mean of its divisors is an integer number (338683467).

Almost surely, 2^1128944885 is an apocalyptic number.

It is an amenable number.

1128944885 is a deficient number, since it is larger than the sum of its proper divisors (225788983).

1128944885 is an equidigital number, since it uses as much as digits as its factorization.

1128944885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225788982.

The product of its digits is 737280, while the sum is 50.

The square root of 1128944885 is about 33599.7750736519. The cubic root of 1128944885 is about 1041.2561513558.

The spelling of 1128944885 in words is "one billion, one hundred twenty-eight million, nine hundred forty-four thousand, eight hundred eighty-five".