1128042985 has 4 divisors (see below), whose sum is σ = 1353651588. Its totient is φ = 902434384.

The previous prime is 1128042983. The next prime is 1128042997. The reversal of 1128042985 is 5892408211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5892408211 = 26017 ⋅226483.

It can be written as a sum of positive squares in 2 ways, for example, as 127712601 + 1000330384 = 11301^2 + 31628^2 .

It is a cyclic number.

It is not a de Polignac number, because 1128042985 - 2¹ = 1128042983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1128042983) 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, 112804294 + ... + 112804303.

It is an arithmetic number, because the mean of its divisors is an integer number (338412897).

Almost surely, 2^1128042985 is an apocalyptic number.

It is an amenable number.

1128042985 is a deficient number, since it is larger than the sum of its proper divisors (225608603).

1128042985 is an equidigital number, since it uses as much as digits as its factorization.

1128042985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225608602.

The product of its (nonzero) digits is 46080, while the sum is 40.

The square root of 1128042985 is about 33586.3511712719. The cubic root of 1128042985 is about 1040.9787952961.

The spelling of 1128042985 in words is "one billion, one hundred twenty-eight million, forty-two thousand, nine hundred eighty-five".