11001131809 has 4 divisors (see below), whose sum is σ = 11003392404. Its totient is φ = 10998871216.

The previous prime is 11001131777. The next prime is 11001131821. The reversal of 11001131809 is 90813110011.

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 4359696784 + 6641435025 = 66028^2 + 81495^2 .

It is a cyclic number.

It is not a de Polignac number, because 11001131809 - 2⁵ = 11001131777 is a prime.

It is a super-2 number, since 2×11001131809² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11001131839) 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, 1122982 + ... + 1132735.

It is an arithmetic number, because the mean of its divisors is an integer number (2750848101).

Almost surely, 2^11001131809 is an apocalyptic number.

It is an amenable number.

11001131809 is a deficient number, since it is larger than the sum of its proper divisors (2260595).

11001131809 is an equidigital number, since it uses as much as digits as its factorization.

11001131809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2260594.

The product of its (nonzero) digits is 216, while the sum is 25.

The spelling of 11001131809 in words is "eleven billion, one million, one hundred thirty-one thousand, eight hundred nine".