82170851 has 8 divisors (see below), whose sum is σ = 94000224. Its totient is φ = 70364160.

The previous prime is 82170841. The next prime is 82170871. The reversal of 82170851 is 15807128.

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 82170851 - 2⁶ = 82170787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82170841) 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, 2981 + ... + 13161.

It is an arithmetic number, because the mean of its divisors is an integer number (11750028).

Almost surely, 2^82170851 is an apocalyptic number.

82170851 is a deficient number, since it is larger than the sum of its proper divisors (11829373).

82170851 is a wasteful number, since it uses less digits than its factorization.

82170851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11341.

The product of its (nonzero) digits is 4480, while the sum is 32.

The square root of 82170851 is about 9064.8138977036. The cubic root of 82170851 is about 434.7496705652.

Adding to 82170851 its reverse (15807128), we get a palindrome (97977979).

The spelling of 82170851 in words is "eighty-two million, one hundred seventy thousand, eight hundred fifty-one".