81248118 has 32 divisors (see below), whose sum is σ = 186662400. Its totient is φ = 23094720.

The previous prime is 81248071. The next prime is 81248129. The reversal of 81248118 is 81184218.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3498 + ... + 13218.

It is an arithmetic number, because the mean of its divisors is an integer number (5833200).

Almost surely, 2^81248118 is an apocalyptic number.

81248118 is an abundant number, since it is smaller than the sum of its proper divisors (105414282).

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

81248118 is a wasteful number, since it uses less digits than its factorization.

81248118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9932.

The product of its digits is 4096, while the sum is 33.

The square root of 81248118 is about 9013.7737934785. The cubic root of 81248118 is about 433.1162085175.

The spelling of 81248118 in words is "eighty-one million, two hundred forty-eight thousand, one hundred eighteen".