5685781 has 2 divisors, whose sum is σ = 5685782. Its totient is φ = 5685780.

The previous prime is 5685773. The next prime is 5685791. The reversal of 5685781 is 1875865.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2992900 + 2692881 = 1730^2 + 1641^2 .

It is a cyclic number.

It is not a de Polignac number, because 5685781 - 2³ = 5685773 is a prime.

It is a super-2 number, since 2×5685781² = 64656211159922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5685791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2842890 + 2842891.

It is an arithmetic number, because the mean of its divisors is an integer number (2842891).

Almost surely, 2^5685781 is an apocalyptic number.

It is an amenable number.

5685781 is a deficient number, since it is larger than the sum of its proper divisors (1).

5685781 is an equidigital number, since it uses as much as digits as its factorization.

5685781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 67200, while the sum is 40.

The square root of 5685781 is about 2384.4875759794. The cubic root of 5685781 is about 178.4829392582.

The spelling of 5685781 in words is "five million, six hundred eighty-five thousand, seven hundred eighty-one".