861081108 has 48 divisors (see below), whose sum is σ = 2083656960. Its totient is φ = 276438400.

The previous prime is 861081103. The next prime is 861081157. The reversal of 861081108 is 801180168.

It is a super-3 number, since 3×861081108³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861081103) 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 15 ways as a sum of consecutive naturals, for example, 147118 + ... + 152858.

It is an arithmetic number, because the mean of its divisors is an integer number (43409520).

Almost surely, 2^861081108 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 861081108, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1041828480).

861081108 is an abundant number, since it is smaller than the sum of its proper divisors (1222575852).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

861081108 is a wasteful number, since it uses less digits than its factorization.

861081108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6208 (or 6206 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 33.

The square root of 861081108 is about 29344.1835463180. The cubic root of 861081108 is about 951.3668626971.

The spelling of 861081108 in words is "eight hundred sixty-one million, eighty-one thousand, one hundred eight".