8516861 has 4 divisors (see below), whose sum is σ = 8524800. Its totient is φ = 8508924.

The previous prime is 8516857. The next prime is 8516863. The reversal of 8516861 is 1686158.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1686158 = 2 ⋅843079.

It is a cyclic number.

It is not a de Polignac number, because 8516861 - 2² = 8516857 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8516863) 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, 2051 + ... + 4608.

It is an arithmetic number, because the mean of its divisors is an integer number (2131200).

Almost surely, 2^8516861 is an apocalyptic number.

It is an amenable number.

8516861 is a deficient number, since it is larger than the sum of its proper divisors (7939).

8516861 is a wasteful number, since it uses less digits than its factorization.

8516861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7938.

The product of its digits is 11520, while the sum is 35.

The square root of 8516861 is about 2918.3661524901. The cubic root of 8516861 is about 204.2176086868.

The spelling of 8516861 in words is "eight million, five hundred sixteen thousand, eight hundred sixty-one".