81102012 has 12 divisors (see below), whose sum is σ = 189238056. Its totient is φ = 27034000.

The previous prime is 81102011. The next prime is 81102017. The reversal of 81102012 is 21020118.

81102012 is digitally balanced in base 9, 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 (12).

81102012 is strictly pandigital in base 9.

It is a junction number, because it is equal to n+sod(n) for n = 81101982 and 81102000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81102011) 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 3 ways as a sum of consecutive naturals, for example, 3379239 + ... + 3379262.

It is an arithmetic number, because the mean of its divisors is an integer number (15769838).

Almost surely, 2^81102012 is an apocalyptic number.

It is an amenable number.

81102012 is an abundant number, since it is smaller than the sum of its proper divisors (108136044).

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

81102012 is a wasteful number, since it uses less digits than its factorization.

81102012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6758508 (or 6758506 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

The square root of 81102012 is about 9005.6655500857. The cubic root of 81102012 is about 432.8564328727.

The spelling of 81102012 in words is "eighty-one million, one hundred two thousand, twelve".