81171 has 12 divisors (see below), whose sum is σ = 121680. Its totient is φ = 52080.
The previous prime is 81163. The next prime is 81173. The reversal of 81171 is 17118.
It is not a de Polignac number, because 81171 - 23 = 81163 is a prime.
It is not an unprimeable number, because it can be changed into a prime (81173) by changing a digit.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 106 + ... + 416.
It is an arithmetic number, because the mean of its divisors is an integer number (10140).
281171 is an apocalyptic number.
81171 is a deficient number, since it is larger than the sum of its proper divisors (40509).
81171 is a wasteful number, since it uses less digits than its factorization.
81171 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 346 (or 343 counting only the distinct ones).
The product of its digits is 56, while the sum is 18.
The square root of 81171 is about 284.9052474069. The cubic root of 81171 is about 43.2979131992.
Adding to 81171 its reverse (17118), we get a palindrome (98289).
It can be divided in two parts, 8117 and 1, that added together give a palindrome (8118).
The spelling of 81171 in words is "eighty-one thousand, one hundred seventy-one".
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