2681861 has 12 divisors (see below), whose sum is σ = 3320352. Its totient is φ = 2120976.

The previous prime is 2681857. The next prime is 2681863. The reversal of 2681861 is 1681862.

It is not a de Polignac number, because 2681861 - 2² = 2681857 is a prime.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2681863) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50 + ... + 2316.

It is an arithmetic number, because the mean of its divisors is an integer number (276696).

2^2681861 is an apocalyptic number.

It is an amenable number.

2681861 is a deficient number, since it is larger than the sum of its proper divisors (638491).

2681861 is a wasteful number, since it uses less digits than its factorization.

2681861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2300 (or 2287 counting only the distinct ones).

The product of its digits is 4608, while the sum is 32.

The square root of 2681861 is about 1637.6388490751. The cubic root of 2681861 is about 138.9351352720.

Subtracting from 2681861 its reverse (1681862), we obtain a palindrome (999999).

The spelling of 2681861 in words is "two million, six hundred eighty-one thousand, eight hundred sixty-one".