82171031 has 8 divisors (see below), whose sum is σ = 83291520. Its totient is φ = 81056952.

The previous prime is 82171027. The next prime is 82171039. The reversal of 82171031 is 13017128.

It is a happy number.

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 82171031 - 2² = 82171027 is a prime.

It is a super-2 number, since 2×82171031² = 13504156671205922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 82170988 and 82171006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82171039) 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, 27740 + ... + 30558.

It is an arithmetic number, because the mean of its divisors is an integer number (10411440).

Almost surely, 2^82171031 is an apocalyptic number.

82171031 is a deficient number, since it is larger than the sum of its proper divisors (1120489).

82171031 is a wasteful number, since it uses less digits than its factorization.

82171031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3205.

The product of its (nonzero) digits is 336, while the sum is 23.

The square root of 82171031 is about 9064.8238261976. The cubic root of 82171031 is about 434.7499880130.

Adding to 82171031 its reverse (13017128), we get a palindrome (95188159).

The spelling of 82171031 in words is "eighty-two million, one hundred seventy-one thousand, thirty-one".