5681781 has 12 divisors (see below), whose sum is σ = 9379552. Its totient is φ = 3246696.

The previous prime is 5681777. The next prime is 5681803. The reversal of 5681781 is 1871865.

5681781 is a `hidden beast` number, since 568 + 17 + 81 = 666.

5681781 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 5681781 - 2² = 5681777 is a prime.

It is a super-2 number, since 2×5681781² = 64565270663922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5681761) 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 11 ways as a sum of consecutive naturals, for example, 45031 + ... + 45156.

Almost surely, 2^5681781 is an apocalyptic number.

It is an amenable number.

5681781 is a deficient number, since it is larger than the sum of its proper divisors (3697771).

5681781 is a wasteful number, since it uses less digits than its factorization.

5681781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90200 (or 90197 counting only the distinct ones).

The product of its digits is 13440, while the sum is 36.

The square root of 5681781 is about 2383.6486737772. The cubic root of 5681781 is about 178.4410746347.

The spelling of 5681781 in words is "five million, six hundred eighty-one thousand, seven hundred eighty-one".