8168641 has 4 divisors (see below), whose sum is σ = 8797012. Its totient is φ = 7540272.

The previous prime is 8168623. The next prime is 8168669. The reversal of 8168641 is 1468618.

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 633616 + 7535025 = 796^2 + 2745^2 .

It is a cyclic number.

It is not a de Polignac number, because 8168641 - 2¹¹ = 8166593 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8168597 and 8168606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8168681) 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, 314166 + ... + 314191.

It is an arithmetic number, because the mean of its divisors is an integer number (2199253).

Almost surely, 2^8168641 is an apocalyptic number.

It is an amenable number.

8168641 is a deficient number, since it is larger than the sum of its proper divisors (628371).

8168641 is a wasteful number, since it uses less digits than its factorization.

8168641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 628370.

The product of its digits is 9216, while the sum is 34.

The square root of 8168641 is about 2858.0834487467. The cubic root of 8168641 is about 201.3955807872.

The spelling of 8168641 in words is "eight million, one hundred sixty-eight thousand, six hundred forty-one".