8431681 has 4 divisors (see below), whose sum is σ = 8467200. Its totient is φ = 8396164.

The previous prime is 8431679. The next prime is 8431697. The reversal of 8431681 is 1861348.

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 8431681 - 2¹ = 8431679 is a prime.

It is a super-2 number, since 2×8431681² = 142186488971522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8431651) 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, 17401 + ... + 17878.

It is an arithmetic number, because the mean of its divisors is an integer number (2116800).

Almost surely, 2^8431681 is an apocalyptic number.

It is an amenable number.

8431681 is a deficient number, since it is larger than the sum of its proper divisors (35519).

8431681 is a wasteful number, since it uses less digits than its factorization.

8431681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35518.

The product of its digits is 4608, while the sum is 31.

The square root of 8431681 is about 2903.7356973389. The cubic root of 8431681 is about 203.5345099006.

The spelling of 8431681 in words is "eight million, four hundred thirty-one thousand, six hundred eighty-one".