8661791 has 4 divisors (see below), whose sum is σ = 8863272. Its totient is φ = 8460312.

The previous prime is 8661769. The next prime is 8661799. The reversal of 8661791 is 1971668.

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

It is a cyclic number.

It is not a de Polignac number, because 8661791 - 2⁶ = 8661727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8661799) 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, 100676 + ... + 100761.

It is an arithmetic number, because the mean of its divisors is an integer number (2215818).

Almost surely, 2^8661791 is an apocalyptic number.

8661791 is a deficient number, since it is larger than the sum of its proper divisors (201481).

8661791 is a wasteful number, since it uses less digits than its factorization.

8661791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201480.

The product of its digits is 18144, while the sum is 38.

The square root of 8661791 is about 2943.0920814681. The cubic root of 8661791 is about 205.3694784316.

The spelling of 8661791 in words is "eight million, six hundred sixty-one thousand, seven hundred ninety-one".