81104173 has 8 divisors (see below), whose sum is σ = 82684800. Its totient is φ = 79530528.

The previous prime is 81104171. The next prime is 81104189. The reversal of 81104173 is 37140118.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81104173 - 2¹ = 81104171 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81104171) 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, 25833 + ... + 28801.

It is an arithmetic number, because the mean of its divisors is an integer number (10335600).

Almost surely, 2^81104173 is an apocalyptic number.

It is an amenable number.

81104173 is a deficient number, since it is larger than the sum of its proper divisors (1580627).

81104173 is a wasteful number, since it uses less digits than its factorization.

81104173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3491.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 81104173 is about 9005.7855293139. The cubic root of 81104173 is about 432.8602773907.

The spelling of 81104173 in words is "eighty-one million, one hundred four thousand, one hundred seventy-three".