82172571 has 8 divisors (see below), whose sum is σ = 117991440. Its totient is φ = 50567712.

The previous prime is 82172533. The next prime is 82172581. The reversal of 82172571 is 17527128.

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

It is not a de Polignac number, because 82172571 - 2⁶ = 82172507 is a prime.

It is not an unprimeable number, because it can be changed into a prime (82172521) 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, 1053456 + ... + 1053533.

It is an arithmetic number, because the mean of its divisors is an integer number (14748930).

Almost surely, 2^82172571 is an apocalyptic number.

82172571 is a deficient number, since it is larger than the sum of its proper divisors (35818869).

82172571 is a wasteful number, since it uses less digits than its factorization.

82172571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2107005.

The product of its digits is 7840, while the sum is 33.

The square root of 82172571 is about 9064.9087695354. The cubic root of 82172571 is about 434.7527039369.

Adding to 82172571 its reverse (17527128), we get a palindrome (99699699).

The spelling of 82172571 in words is "eighty-two million, one hundred seventy-two thousand, five hundred seventy-one".