8641691 has 4 divisors (see below), whose sum is σ = 8667672. Its totient is φ = 8615712.

The previous prime is 8641673. The next prime is 8641697. The reversal of 8641691 is 1961468.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8641691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8641697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12485 + ... + 13158.

It is an arithmetic number, because the mean of its divisors is an integer number (2166918).

Almost surely, 2^8641691 is an apocalyptic number.

8641691 is a deficient number, since it is larger than the sum of its proper divisors (25981).

8641691 is a wasteful number, since it uses less digits than its factorization.

8641691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25980.

The product of its digits is 10368, while the sum is 35.

The square root of 8641691 is about 2939.6753222082. The cubic root of 8641691 is about 205.2104996230.

The spelling of 8641691 in words is "eight million, six hundred forty-one thousand, six hundred ninety-one".