2686891 has 2 divisors, whose sum is σ = 2686892. Its totient is φ = 2686890.

The previous prime is 2686889. The next prime is 2686897. The reversal of 2686891 is 1986862.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2686891 - 2¹ = 2686889 is a prime.

Together with 2686889, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2686897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1343445 + 1343446.

It is an arithmetic number, because the mean of its divisors is an integer number (1343446).

2^2686891 is an apocalyptic number.

2686891 is a deficient number, since it is larger than the sum of its proper divisors (1).

2686891 is an equidigital number, since it uses as much as digits as its factorization.

2686891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 40.

The square root of 2686891 is about 1639.1738772931. The cubic root of 2686891 is about 139.0219415702.

The spelling of 2686891 in words is "two million, six hundred eighty-six thousand, eight hundred ninety-one".