2056681 has 8 divisors (see below), whose sum is σ = 2282400. Its totient is φ = 1837440.

The previous prime is 2056679. The next prime is 2056687. The reversal of 2056681 is 1866502.

2056681 = T₆₀₆ + T₆₀₇ + ... + T₆₁₆.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2056681 - 2¹ = 2056679 is a prime.

It is a super-2 number, since 2×2056681² = 8459873471522, which contains 22 as substring.

It is an Ulam number.

It is a deceptive number, since it divides R_2056680.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2056687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 936 + ... + 2233.

It is an arithmetic number, because the mean of its divisors is an integer number (285300).

2^2056681 is an apocalyptic number.

It is an amenable number.

2056681 is a deficient number, since it is larger than the sum of its proper divisors (225719).

2056681 is a wasteful number, since it uses less digits than its factorization.

2056681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3239.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 2056681 is about 1434.1133149093. The cubic root of 2056681 is about 127.1712612909.

It can be divided in two parts, 205 and 6681, that added together give a palindrome (6886).

The spelling of 2056681 in words is "two million, fifty-six thousand, six hundred eighty-one".