8199681 has 32 divisors (see below), whose sum is σ = 13118208. Its totient is φ = 4458240.

The previous prime is 8199679. The next prime is 8199689. The reversal of 8199681 is 1869918.

It is not a de Polignac number, because 8199681 - 2¹ = 8199679 is a prime.

It is a super-2 number, since 2×8199681² = 134469537003522, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (8199689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 47311 + ... + 47483.

It is an arithmetic number, because the mean of its divisors is an integer number (409944).

Almost surely, 2^8199681 is an apocalyptic number.

It is an amenable number.

8199681 is a deficient number, since it is larger than the sum of its proper divisors (4918527).

8199681 is a wasteful number, since it uses less digits than its factorization.

8199681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281.

The product of its digits is 31104, while the sum is 42.

The square root of 8199681 is about 2863.5085122975. The cubic root of 8199681 is about 201.6503525571.

The spelling of 8199681 in words is "eight million, one hundred ninety-nine thousand, six hundred eighty-one".