1101809 has 4 divisors (see below), whose sum is σ = 1112820. Its totient is φ = 1090800.

The previous prime is 1101803. The next prime is 1101811. The reversal of 1101809 is 9081011.

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 717409 + 384400 = 847^2 + 620^2 .

It is not a de Polignac number, because 1101809 - 2²⁰ = 53233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1101803) 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, 5354 + ... + 5555.

It is an arithmetic number, because the mean of its divisors is an integer number (278205).

2^1101809 is an apocalyptic number.

It is an amenable number.

1101809 is a deficient number, since it is larger than the sum of its proper divisors (11011).

1101809 is a wasteful number, since it uses less digits than its factorization.

1101809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11010.

The product of its (nonzero) digits is 72, while the sum is 20.

The square root of 1101809 is about 1049.6709008065. The cubic root of 1101809 is about 103.2845682726.

The spelling of 1101809 in words is "one million, one hundred one thousand, eight hundred nine".