82172471 has 4 divisors (see below), whose sum is σ = 82215000. Its totient is φ = 82129944.

The previous prime is 82172437. The next prime is 82172479. The reversal of 82172471 is 17427128.

It is a happy number.

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-82172471 is a prime.

It is a super-3 number, since 3×82172471³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82172479) 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, 18221 + ... + 22278.

It is an arithmetic number, because the mean of its divisors is an integer number (20553750).

Almost surely, 2^82172471 is an apocalyptic number.

82172471 is a deficient number, since it is larger than the sum of its proper divisors (42529).

82172471 is a wasteful number, since it uses less digits than its factorization.

82172471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42528.

The product of its digits is 6272, while the sum is 32.

The square root of 82172471 is about 9064.9032537584. The cubic root of 82172471 is about 434.7525275793.

Adding to 82172471 its reverse (17427128), we get a palindrome (99599599).

The spelling of 82172471 in words is "eighty-two million, one hundred seventy-two thousand, four hundred seventy-one".