1811000109 has 4 divisors (see below), whose sum is σ = 2414666816. Its totient is φ = 1207333404.

The previous prime is 1811000077. The next prime is 1811000117. The reversal of 1811000109 is 9010001181.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9010001181 = 3 ⋅3003333727.

It is not a de Polignac number, because 1811000109 - 2⁵ = 1811000077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1811000119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 301833349 + ... + 301833354.

It is an arithmetic number, because the mean of its divisors is an integer number (603666704).

Almost surely, 2^1811000109 is an apocalyptic number.

It is an amenable number.

1811000109 is a deficient number, since it is larger than the sum of its proper divisors (603666707).

1811000109 is an equidigital number, since it uses as much as digits as its factorization.

1811000109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 603666706.

The product of its (nonzero) digits is 72, while the sum is 21.

The square root of 1811000109 is about 42555.8469425765. The cubic root of 1811000109 is about 1218.9133271395.

The spelling of 1811000109 in words is "one billion, eight hundred eleven million, one hundred nine", and thus it is an aban number.