5668681 has 2 divisors, whose sum is σ = 5668682. Its totient is φ = 5668680.

The previous prime is 5668673. The next prime is 5668687. The reversal of 5668681 is 1868665.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4020025 + 1648656 = 2005^2 + 1284^2 .

It is a cyclic number.

It is not a de Polignac number, because 5668681 - 2³ = 5668673 is a prime.

It is a super-2 number, since 2×5668681² = 64267888559522, which contains 22 as substring.

It is a Chen prime.

5668681 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (5668687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2834340 + 2834341.

It is an arithmetic number, because the mean of its divisors is an integer number (2834341).

Almost surely, 2^5668681 is an apocalyptic number.

It is an amenable number.

5668681 is a deficient number, since it is larger than the sum of its proper divisors (1).

5668681 is an equidigital number, since it uses as much as digits as its factorization.

5668681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69120, while the sum is 40.

The square root of 5668681 is about 2380.8991998823. The cubic root of 5668681 is about 178.3038302918.

The spelling of 5668681 in words is "five million, six hundred sixty-eight thousand, six hundred eighty-one".