2055681 has 6 divisors (see below), whose sum is σ = 2969330. Its totient is φ = 1370448.

The previous prime is 2055679. The next prime is 2055689. The reversal of 2055681 is 1865502.

It can be written as a sum of positive squares in only one way, i.e., 2005056 + 50625 = 1416^2 + 225^2 .

It is not a de Polignac number, because 2055681 - 2¹ = 2055679 is a prime.

It is a super-2 number, since 2×2055681² = 8451648747522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2055689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 114196 + ... + 114213.

2^2055681 is an apocalyptic number.

It is an amenable number.

2055681 is a deficient number, since it is larger than the sum of its proper divisors (913649).

2055681 is a wasteful number, since it uses less digits than its factorization.

2055681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228415 (or 228412 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 2055681 is about 1433.7646250344. The cubic root of 2055681 is about 127.1506468676.

It can be divided in two parts, 205 and 5681, that added together give a triangular number (5886 = T₁₀₈).

The spelling of 2055681 in words is "two million, fifty-five thousand, six hundred eighty-one".