11771809409 has 8 divisors (see below), whose sum is σ = 12520166400. Its totient is φ = 11029663296.

The previous prime is 11771809391. The next prime is 11771809421. The reversal of 11771809409 is 90490817711.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11771809409 - 2²⁸ = 11503373953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11771809429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1548809 + ... + 1556390.

It is an arithmetic number, because the mean of its divisors is an integer number (1565020800).

Almost surely, 2^11771809409 is an apocalyptic number.

It is an amenable number.

11771809409 is a deficient number, since it is larger than the sum of its proper divisors (748356991).

11771809409 is a wasteful number, since it uses less digits than its factorization.

11771809409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3105439.

The product of its (nonzero) digits is 127008, while the sum is 47.

The spelling of 11771809409 in words is "eleven billion, seven hundred seventy-one million, eight hundred nine thousand, four hundred nine".