81170 has 8 divisors (see below), whose sum is σ = 146124. Its totient is φ = 32464.

The previous prime is 81163. The next prime is 81173. The reversal of 81170 is 7118.

It can be written as a sum of positive squares in 2 ways, for example, as 78961 + 2209 = 281^2 + 47^2 .

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

It is not an unprimeable number, because it can be changed into a prime (81173) by changing a digit.

81170 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4049 + ... + 4068.

2⁸¹¹⁷⁰ is an apocalyptic number.

81170 is a deficient number, since it is larger than the sum of its proper divisors (64954).

81170 is a wasteful number, since it uses less digits than its factorization.

81170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8124.

The product of its (nonzero) digits is 56, while the sum is 17.

The square root of 81170 is about 284.9034924321. The cubic root of 81170 is about 43.2977353932.

Adding to 81170 its reverse (7118), we get a palindrome (88288).

The spelling of 81170 in words is "eighty-one thousand, one hundred seventy".