861813112 has 16 divisors (see below), whose sum is σ = 1655312400. Its totient is φ = 420396480.

The previous prime is 861813109. The next prime is 861813119. The reversal of 861813112 is 211318168.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861813119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1313412 + ... + 1314067.

It is an arithmetic number, because the mean of its divisors is an integer number (103457025).

Almost surely, 2^861813112 is an apocalyptic number.

861813112 is a gapful number since it is divisible by the number (82) formed by its first and last digit.

It is an amenable number.

861813112 is a deficient number, since it is larger than the sum of its proper divisors (793499288).

861813112 is a wasteful number, since it uses less digits than its factorization.

861813112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2627526 (or 2627522 counting only the distinct ones).

The product of its digits is 2304, while the sum is 31.

The square root of 861813112 is about 29356.6536240083. The cubic root of 861813112 is about 951.6363716118.

The spelling of 861813112 in words is "eight hundred sixty-one million, eight hundred thirteen thousand, one hundred twelve".