81086173 has 8 divisors (see below), whose sum is σ = 95659520. Its totient is φ = 67260240.

The previous prime is 81086171. The next prime is 81086177. The reversal of 81086173 is 37168018.

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 81086173 - 2¹ = 81086171 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 (81086171) 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, 186618 + ... + 187051.

It is an arithmetic number, because the mean of its divisors is an integer number (11957440).

Almost surely, 2^81086173 is an apocalyptic number.

It is an amenable number.

81086173 is a deficient number, since it is larger than the sum of its proper divisors (14573347).

81086173 is a wasteful number, since it uses less digits than its factorization.

81086173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373707.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 81086173 is about 9004.7861162828. The cubic root of 81086173 is about 432.8282524809.

The spelling of 81086173 in words is "eighty-one million, eighty-six thousand, one hundred seventy-three".