2686681 has 4 divisors (see below), whose sum is σ = 2759332. Its totient is φ = 2614032.

The previous prime is 2686669. The next prime is 2686693. The reversal of 2686681 is 1866862.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (2686669) and next prime (2686693).

It can be written as a sum of positive squares in 2 ways, for example, as 2277081 + 409600 = 1509^2 + 640^2 .

It is a cyclic number.

It is not a de Polignac number, because 2686681 - 2¹⁵ = 2653913 is a prime.

It is a super-2 number, since 2×2686681² = 14436509591522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 72613 = 2686681 / (2 + 6 + 8 + 6 + 6 + 8 + 1).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2686681.

It is not an unprimeable number, because it can be changed into a prime (2686631) 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, 36270 + ... + 36343.

It is an arithmetic number, because the mean of its divisors is an integer number (689833).

2^2686681 is an apocalyptic number.

It is an amenable number.

2686681 is a deficient number, since it is larger than the sum of its proper divisors (72651).

2686681 is an equidigital number, since it uses as much as digits as its factorization.

2686681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72650.

The product of its digits is 27648, while the sum is 37.

The square root of 2686681 is about 1639.1098193837. The cubic root of 2686681 is about 139.0183196185.

The spelling of 2686681 in words is "two million, six hundred eighty-six thousand, six hundred eighty-one".