5671681 has 2 divisors, whose sum is σ = 5671682. Its totient is φ = 5671680.

The previous prime is 5671669. The next prime is 5671697. The reversal of 5671681 is 1861765.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3686400 + 1985281 = 1920^2 + 1409^2 .

It is a cyclic number.

It is not a de Polignac number, because 5671681 - 2⁵ = 5671649 is a prime.

It is a super-2 number, since 2×5671681² = 64335930731522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5671621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2835840 + 2835841.

It is an arithmetic number, because the mean of its divisors is an integer number (2835841).

Almost surely, 2^5671681 is an apocalyptic number.

It is an amenable number.

5671681 is a deficient number, since it is larger than the sum of its proper divisors (1).

5671681 is an equidigital number, since it uses as much as digits as its factorization.

5671681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 34.

The square root of 5671681 is about 2381.5291306218. The cubic root of 5671681 is about 178.3352789454.

The spelling of 5671681 in words is "five million, six hundred seventy-one thousand, six hundred eighty-one".