8129681 has 8 divisors (see below), whose sum is σ = 9329280. Its totient is φ = 6939648.

The previous prime is 8129659. The next prime is 8129683. The reversal of 8129681 is 1869218.

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 8129681 - 2¹⁴ = 8113297 is a prime.

It is a super-2 number, since 2×8129681² = 132183426323522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8129683) 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, 461 + ... + 4058.

It is an arithmetic number, because the mean of its divisors is an integer number (1166160).

Almost surely, 2^8129681 is an apocalyptic number.

It is an amenable number.

8129681 is a deficient number, since it is larger than the sum of its proper divisors (1199599).

8129681 is a wasteful number, since it uses less digits than its factorization.

8129681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4783.

The product of its digits is 6912, while the sum is 35.

The square root of 8129681 is about 2851.2595462357. The cubic root of 8129681 is about 201.0748877326.

The spelling of 8129681 in words is "eight million, one hundred twenty-nine thousand, six hundred eighty-one".