81241112 has 32 divisors (see below), whose sum is σ = 163080000. Its totient is φ = 37826208.

The previous prime is 81241099. The next prime is 81241117. The reversal of 81241112 is 21114218.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81241117) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4439 + ... + 13497.

It is an arithmetic number, because the mean of its divisors is an integer number (5096250).

Almost surely, 2^81241112 is an apocalyptic number.

It is an amenable number.

81241112 is an abundant number, since it is smaller than the sum of its proper divisors (81838888).

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

81241112 is a wasteful number, since it uses less digits than its factorization.

81241112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9143 (or 9139 counting only the distinct ones).

The product of its digits is 128, while the sum is 20.

The square root of 81241112 is about 9013.3851576419. The cubic root of 81241112 is about 433.1037590009.

The spelling of 81241112 in words is "eighty-one million, two hundred forty-one thousand, one hundred twelve".