2681891 has 4 divisors (see below), whose sum is σ = 2774400. Its totient is φ = 2589384.

The previous prime is 2681881. The next prime is 2681893. The reversal of 2681891 is 1981862.

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

It is a cyclic number.

It is not a de Polignac number, because 2681891 - 2⁶ = 2681827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2681893) 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, 46211 + ... + 46268.

It is an arithmetic number, because the mean of its divisors is an integer number (693600).

2^2681891 is an apocalyptic number.

2681891 is a deficient number, since it is larger than the sum of its proper divisors (92509).

2681891 is an equidigital number, since it uses as much as digits as its factorization.

2681891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92508.

The product of its digits is 6912, while the sum is 35.

The square root of 2681891 is about 1637.6480085782. The cubic root of 2681891 is about 138.9356533251.

The spelling of 2681891 in words is "two million, six hundred eighty-one thousand, eight hundred ninety-one".