2686861 has 2 divisors, whose sum is σ = 2686862. Its totient is φ = 2686860.

The previous prime is 2686841. The next prime is 2686889. The reversal of 2686861 is 1686862.

2686861 is nontrivially palindromic in base 11.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2205225 + 481636 = 1485^2 + 694^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2686861 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2686861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2686811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1343430 + 1343431.

It is an arithmetic number, because the mean of its divisors is an integer number (1343431).

2^2686861 is an apocalyptic number.

It is an amenable number.

2686861 is a deficient number, since it is larger than the sum of its proper divisors (1).

2686861 is an equidigital number, since it uses as much as digits as its factorization.

2686861 is an evil number, because the sum of its binary digits is even.

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

The square root of 2686861 is about 1639.1647263164. The cubic root of 2686861 is about 139.0214241601.

Subtracting from 2686861 its reverse (1686862), we obtain a palindrome (999999).

The spelling of 2686861 in words is "two million, six hundred eighty-six thousand, eight hundred sixty-one".