5691681 has 8 divisors (see below), whose sum is σ = 8432160. Its totient is φ = 3794436.

The previous prime is 5691667. The next prime is 5691689. The reversal of 5691681 is 1861965.

5691681 is a `hidden beast` number, since 569 + 16 + 81 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-5691681 is a prime.

It is a super-2 number, since 2×5691681² = 64790465211522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (5691689) 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 7 ways as a sum of consecutive naturals, for example, 105375 + ... + 105428.

It is an arithmetic number, because the mean of its divisors is an integer number (1054020).

Almost surely, 2^5691681 is an apocalyptic number.

It is an amenable number.

5691681 is a deficient number, since it is larger than the sum of its proper divisors (2740479).

5691681 is a wasteful number, since it uses less digits than its factorization.

5691681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210812 (or 210806 counting only the distinct ones).

The product of its digits is 12960, while the sum is 36.

The square root of 5691681 is about 2385.7244182847. The cubic root of 5691681 is about 178.5446537532.

The spelling of 5691681 in words is "five million, six hundred ninety-one thousand, six hundred eighty-one".