2686691 has 4 divisors (see below), whose sum is σ = 3070512. Its totient is φ = 2302872.

The previous prime is 2686669. The next prime is 2686693. The reversal of 2686691 is 1966862.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1966862 = 2 ⋅983431.

It is a cyclic number.

It is not a de Polignac number, because 2686691 - 2¹⁰ = 2685667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2686693) 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, 191900 + ... + 191913.

It is an arithmetic number, because the mean of its divisors is an integer number (767628).

2^2686691 is an apocalyptic number.

2686691 is a deficient number, since it is larger than the sum of its proper divisors (383821).

2686691 is an equidigital number, since it uses as much as digits as its factorization.

2686691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383820.

The product of its digits is 31104, while the sum is 38.

The square root of 2686691 is about 1639.1128698171. The cubic root of 2686691 is about 139.0184920966.

The spelling of 2686691 in words is "two million, six hundred eighty-six thousand, six hundred ninety-one".