81093912 has 16 divisors (see below), whose sum is σ = 202734840. Its totient is φ = 27031296.

The previous prime is 81093911. The next prime is 81093913. The reversal of 81093912 is 21939018.

It is an interprime number because it is at equal distance from previous prime (81093911) and next prime (81093913).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81093911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1689433 + ... + 1689480.

Almost surely, 2^81093912 is an apocalyptic number.

It is an amenable number.

81093912 is an abundant number, since it is smaller than the sum of its proper divisors (121640928).

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

81093912 is a wasteful number, since it uses less digits than its factorization.

81093912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3378922 (or 3378918 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 81093912 is about 9005.2158219556. The cubic root of 81093912 is about 432.8420219937.

It can be divided in two parts, 8109 and 3912, that added together give a palindrome (12021).

The spelling of 81093912 in words is "eighty-one million, ninety-three thousand, nine hundred twelve".