82131571 has 8 divisors (see below), whose sum is σ = 83289024. Its totient is φ = 80978280.

The previous prime is 82131557. The next prime is 82131587. The reversal of 82131571 is 17513128.

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 82131571 - 2⁷ = 82131443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82131521) 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, 74736 + ... + 75826.

It is an arithmetic number, because the mean of its divisors is an integer number (10411128).

Almost surely, 2^82131571 is an apocalyptic number.

82131571 is a deficient number, since it is larger than the sum of its proper divisors (1157453).

82131571 is a wasteful number, since it uses less digits than its factorization.

82131571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2081.

The product of its digits is 1680, while the sum is 28.

The square root of 82131571 is about 9062.6470194971. The cubic root of 82131571 is about 434.6803852949.

Adding to 82131571 its reverse (17513128), we get a palindrome (99644699).

The spelling of 82131571 in words is "eighty-two million, one hundred thirty-one thousand, five hundred seventy-one".