1085081809 has 16 divisors (see below), whose sum is σ = 1307344896. Its totient is φ = 880909200.

The previous prime is 1085081801. The next prime is 1085081813. The reversal of 1085081809 is 9081805801.

It is a cyclic number.

It is not a de Polignac number, because 1085081809 - 2³ = 1085081801 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1085081801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42997 + ... + 63394.

It is an arithmetic number, because the mean of its divisors is an integer number (81709056).

Almost surely, 2^1085081809 is an apocalyptic number.

It is an amenable number.

1085081809 is a deficient number, since it is larger than the sum of its proper divisors (222263087).

1085081809 is a wasteful number, since it uses less digits than its factorization.

1085081809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106476.

The product of its (nonzero) digits is 23040, while the sum is 40.

The square root of 1085081809 is about 32940.5799736435. The cubic root of 1085081809 is about 1027.5922674724.

The spelling of 1085081809 in words is "one billion, eighty-five million, eighty-one thousand, eight hundred nine".