861111612 has 36 divisors (see below), whose sum is σ = 2178985536. Its totient is φ = 286735680.

The previous prime is 861111611. The next prime is 861111623. The reversal of 861111612 is 216111168.

861111612 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861111611) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23608 + ... + 47744.

It is an arithmetic number, because the mean of its divisors is an integer number (60527376).

Almost surely, 2^861111612 is an apocalyptic number.

It is an amenable number.

861111612 is an abundant number, since it is smaller than the sum of its proper divisors (1317873924).

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

861111612 is a wasteful number, since it uses less digits than its factorization.

861111612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25138 (or 25133 counting only the distinct ones).

The product of its digits is 576, while the sum is 27.

The square root of 861111612 is about 29344.7033040036. The cubic root of 861111612 is about 951.3780966958.

The spelling of 861111612 in words is "eight hundred sixty-one million, one hundred eleven thousand, six hundred twelve".