6971681 has 8 divisors (see below), whose sum is σ = 7219464. Its totient is φ = 6727680.

The previous prime is 6971677. The next prime is 6971693. The reversal of 6971681 is 1861796.

It can be written as a sum of positive squares in 4 ways, for example, as 341056 + 6630625 = 584^2 + 2575^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6971681 - 2² = 6971677 is a prime.

It is a super-2 number, since 2×6971681² = 97208671931522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6971611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3101 + ... + 4853.

It is an arithmetic number, because the mean of its divisors is an integer number (902433).

Almost surely, 2^6971681 is an apocalyptic number.

It is an amenable number.

6971681 is a deficient number, since it is larger than the sum of its proper divisors (247783).

6971681 is a wasteful number, since it uses less digits than its factorization.

6971681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1891.

The product of its digits is 18144, while the sum is 38.

The square root of 6971681 is about 2640.3940993723. The cubic root of 6971681 is about 191.0348062990.

The spelling of 6971681 in words is "six million, nine hundred seventy-one thousand, six hundred eighty-one".