1089090809 has 4 divisors (see below), whose sum is σ = 1093610100. Its totient is φ = 1084571520.

The previous prime is 1089090787. The next prime is 1089090817. The reversal of 1089090809 is 9080909801.

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 971693584 + 117397225 = 31172^2 + 10835^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1089090809 is a prime.

It is a super-2 number, since 2×1089090809² = 2372237580496548962, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1089090809.

It is not an unprimeable number, because it can be changed into a prime (1089098809) 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, 2259284 + ... + 2259765.

It is an arithmetic number, because the mean of its divisors is an integer number (273402525).

Almost surely, 2^1089090809 is an apocalyptic number.

It is an amenable number.

1089090809 is a deficient number, since it is larger than the sum of its proper divisors (4519291).

1089090809 is an equidigital number, since it uses as much as digits as its factorization.

1089090809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4519290.

The product of its (nonzero) digits is 46656, while the sum is 44.

The square root of 1089090809 is about 33001.3758652575. The cubic root of 1089090809 is about 1028.8562441411.

The spelling of 1089090809 in words is "one billion, eighty-nine million, ninety thousand, eight hundred nine".