82142171 has 4 divisors (see below), whose sum is σ = 82173744. Its totient is φ = 82110600.

The previous prime is 82142161. The next prime is 82142197. The reversal of 82142171 is 17124128.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82142171 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 82142171.

It is not an unprimeable number, because it can be changed into a prime (82142141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11495 + ... + 17216.

It is an arithmetic number, because the mean of its divisors is an integer number (20543436).

Almost surely, 2^82142171 is an apocalyptic number.

82142171 is a deficient number, since it is larger than the sum of its proper divisors (31573).

82142171 is a wasteful number, since it uses less digits than its factorization.

82142171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31572.

The product of its digits is 896, while the sum is 26.

The square root of 82142171 is about 9063.2318187278. The cubic root of 82142171 is about 434.6990846160.

Adding to 82142171 its reverse (17124128), we get a palindrome (99266299).

The spelling of 82142171 in words is "eighty-two million, one hundred forty-two thousand, one hundred seventy-one".