8120861 has 8 divisors (see below), whose sum is σ = 9330624. Its totient is φ = 6923520.

The previous prime is 8120843. The next prime is 8120867. The reversal of 8120861 is 1680218.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8120861 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8120861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8120867) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1655 + ... + 4356.

It is an arithmetic number, because the mean of its divisors is an integer number (1166328).

Almost surely, 2^8120861 is an apocalyptic number.

It is an amenable number.

8120861 is a deficient number, since it is larger than the sum of its proper divisors (1209763).

8120861 is a wasteful number, since it uses less digits than its factorization.

8120861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6211.

The product of its (nonzero) digits is 768, while the sum is 26.

The square root of 8120861 is about 2849.7124416334. The cubic root of 8120861 is about 201.0021451385.

The spelling of 8120861 in words is "eight million, one hundred twenty thousand, eight hundred sixty-one".