81119412 has 72 divisors (see below), whose sum is σ = 226611840. Its totient is φ = 24261120.

The previous prime is 81119377. The next prime is 81119431. The reversal of 81119412 is 21491118.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 29988 + ... + 32580.

Almost surely, 2^81119412 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 81119412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113305920).

81119412 is an abundant number, since it is smaller than the sum of its proper divisors (145492428).

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

81119412 is a wasteful number, since it uses less digits than its factorization.

81119412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2693 (or 2688 counting only the distinct ones).

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

The square root of 81119412 is about 9006.6315568030. The cubic root of 81119412 is about 432.8873863315.

The spelling of 81119412 in words is "eighty-one million, one hundred nineteen thousand, four hundred twelve".