8179681 has 4 divisors (see below), whose sum is σ = 8207892. Its totient is φ = 8151472.

The previous prime is 8179679. The next prime is 8179693. The reversal of 8179681 is 1869718.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7750656 + 429025 = 2784^2 + 655^2 .

It is a cyclic number.

It is not a de Polignac number, because 8179681 - 2¹ = 8179679 is a prime.

It is a super-2 number, since 2×8179681² = 133814362523522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8179621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13666 + ... + 14251.

It is an arithmetic number, because the mean of its divisors is an integer number (2051973).

Almost surely, 2^8179681 is an apocalyptic number.

It is an amenable number.

8179681 is a deficient number, since it is larger than the sum of its proper divisors (28211).

8179681 is a wasteful number, since it uses less digits than its factorization.

8179681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28210.

The product of its digits is 24192, while the sum is 40.

The square root of 8179681 is about 2860.0141608041. The cubic root of 8179681 is about 201.4862693244.

It can be divided in two parts, 81796 and 81, that multiplied together give a square (6625476 = 2574²).

The spelling of 8179681 in words is "eight million, one hundred seventy-nine thousand, six hundred eighty-one".