8351681 has 8 divisors (see below), whose sum is σ = 9304680. Its totient is φ = 7443072.

The previous prime is 8351669. The next prime is 8351699. The reversal of 8351681 is 1861538.

8351681 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 34225 + 8317456 = 185^2 + 2884^2 .

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

It is not a de Polignac number, because 8351681 - 2¹⁴ = 8335297 is a prime.

It is a super-2 number, since 2×8351681² = 139501151051522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8351281) 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, 10700 + ... + 11453.

It is an arithmetic number, because the mean of its divisors is an integer number (1163085).

Almost surely, 2^8351681 is an apocalyptic number.

It is an amenable number.

8351681 is a deficient number, since it is larger than the sum of its proper divisors (952999).

8351681 is a wasteful number, since it uses less digits than its factorization.

8351681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22195.

The product of its digits is 5760, while the sum is 32.

The square root of 8351681 is about 2889.9275077413. The cubic root of 8351681 is about 202.8887497393. Note that the first 3 decimals are identical.

The spelling of 8351681 in words is "eight million, three hundred fifty-one thousand, six hundred eighty-one".