8163681 has 4 divisors (see below), whose sum is σ = 10884912. Its totient is φ = 5442452.

The previous prime is 8163647. The next prime is 8163709. The reversal of 8163681 is 1863618.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8163681 - 2²² = 3969377 is a prime.

It is a super-2 number, since 2×8163681² = 133291374939522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (8163641) 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 3 ways as a sum of consecutive naturals, for example, 1360611 + ... + 1360616.

It is an arithmetic number, because the mean of its divisors is an integer number (2721228).

Almost surely, 2^8163681 is an apocalyptic number.

It is an amenable number.

8163681 is a deficient number, since it is larger than the sum of its proper divisors (2721231).

8163681 is a wasteful number, since it uses less digits than its factorization.

8163681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2721230.

The product of its digits is 6912, while the sum is 33.

The square root of 8163681 is about 2857.2156026453. The cubic root of 8163681 is about 201.3548100588.

The spelling of 8163681 in words is "eight million, one hundred sixty-three thousand, six hundred eighty-one".