81844113 has 16 divisors (see below), whose sum is σ = 117728576. Its totient is φ = 50276160.

The previous prime is 81844099. The next prime is 81844121. The reversal of 81844113 is 31144818.

It is not a de Polignac number, because 81844113 - 2⁸ = 81843857 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (81844163) 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 15 ways as a sum of consecutive naturals, for example, 25431 + ... + 28467.

It is an arithmetic number, because the mean of its divisors is an integer number (7358036).

Almost surely, 2^81844113 is an apocalyptic number.

It is an amenable number.

81844113 is a deficient number, since it is larger than the sum of its proper divisors (35884463).

81844113 is a wasteful number, since it uses less digits than its factorization.

81844113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3744.

The product of its digits is 3072, while the sum is 30.

The square root of 81844113 is about 9046.7736237843. The cubic root of 81844113 is about 434.1726697953.

The spelling of 81844113 in words is "eighty-one million, eight hundred forty-four thousand, one hundred thirteen".