1100809 has 4 divisors (see below), whose sum is σ = 1127700. Its totient is φ = 1073920.

The previous prime is 1100807. The next prime is 1100831. The reversal of 1100809 is 9080011.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9080011 = 1481 ⋅6131.

It can be written as a sum of positive squares in 2 ways, for example, as 156025 + 944784 = 395^2 + 972^2 .

It is a cyclic number.

It is not a de Polignac number, because 1100809 - 2¹ = 1100807 is a prime.

It is a Duffinian number.

1100809 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1100807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13384 + ... + 13465.

It is an arithmetic number, because the mean of its divisors is an integer number (281925).

2^1100809 is an apocalyptic number.

It is an amenable number.

1100809 is a deficient number, since it is larger than the sum of its proper divisors (26891).

1100809 is an equidigital number, since it uses as much as digits as its factorization.

1100809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26890.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 1100809 is about 1049.1944529018. The cubic root of 1100809 is about 103.2533118477.

The spelling of 1100809 in words is "one million, one hundred thousand, eight hundred nine".