8641861 has 4 divisors (see below), whose sum is σ = 8770912. Its totient is φ = 8512812.

The previous prime is 8641819. The next prime is 8641873. The reversal of 8641861 is 1681468.

8641861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 8641861 - 2⁷ = 8641733 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 (8641891) 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, 64425 + ... + 64558.

It is an arithmetic number, because the mean of its divisors is an integer number (2192728).

Almost surely, 2^8641861 is an apocalyptic number.

It is an amenable number.

8641861 is a deficient number, since it is larger than the sum of its proper divisors (129051).

8641861 is a wasteful number, since it uses less digits than its factorization.

8641861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129050.

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

The square root of 8641861 is about 2939.7042368238. The cubic root of 8641861 is about 205.2118452530.

The spelling of 8641861 in words is "eight million, six hundred forty-one thousand, eight hundred sixty-one".