2086691 has 4 divisors (see below), whose sum is σ = 2089584. Its totient is φ = 2083800.

The previous prime is 2086681. The next prime is 2086697. The reversal of 2086691 is 1966802.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2086691 - 2¹⁰ = 2085667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2086697) 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, 626 + ... + 2136.

It is an arithmetic number, because the mean of its divisors is an integer number (522396).

2^2086691 is an apocalyptic number.

2086691 is a deficient number, since it is larger than the sum of its proper divisors (2893).

2086691 is a wasteful number, since it uses less digits than its factorization.

2086691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2892.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 2086691 is about 1444.5383345554. The cubic root of 2086691 is about 127.7868155478.

The spelling of 2086691 in words is "two million, eighty-six thousand, six hundred ninety-one".