81170194 has 16 divisors (see below), whose sum is σ = 141508800. Its totient is φ = 34197264.

The previous prime is 81170161. The next prime is 81170213. The reversal of 81170194 is 49107118.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 48309 + ... + 49960.

It is an arithmetic number, because the mean of its divisors is an integer number (8844300).

Almost surely, 2^81170194 is an apocalyptic number.

81170194 is a deficient number, since it is larger than the sum of its proper divisors (60338606).

81170194 is a wasteful number, since it uses less digits than its factorization.

81170194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98337.

The product of its (nonzero) digits is 2016, while the sum is 31.

The square root of 81170194 is about 9009.4502606985. The cubic root of 81170194 is about 432.9776988765.

The spelling of 81170194 in words is "eighty-one million, one hundred seventy thousand, one hundred ninety-four".