2116809 has 12 divisors (see below), whose sum is σ = 3218800. Its totient is φ = 1336824.

The previous prime is 2116801. The next prime is 2116811. The reversal of 2116809 is 9086112.

It is not a de Polignac number, because 2116809 - 2³ = 2116801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2116801) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6019 + ... + 6360.

2^2116809 is an apocalyptic number.

It is an amenable number.

2116809 is a deficient number, since it is larger than the sum of its proper divisors (1101991).

2116809 is a wasteful number, since it uses less digits than its factorization.

2116809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12404 (or 12401 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 2116809 is about 1454.9257713024. The cubic root of 2116809 is about 128.3986796382.

The spelling of 2116809 in words is "two million, one hundred sixteen thousand, eight hundred nine".