82170111 has 16 divisors (see below), whose sum is σ = 111827168. Its totient is φ = 53654400.

The previous prime is 82170107. The next prime is 82170131. The reversal of 82170111 is 11107128.

It is not a de Polignac number, because 82170111 - 2² = 82170107 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82170131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49881 + ... + 51501.

It is an arithmetic number, because the mean of its divisors is an integer number (6989198).

Almost surely, 2^82170111 is an apocalyptic number.

82170111 is a deficient number, since it is larger than the sum of its proper divisors (29657057).

82170111 is a wasteful number, since it uses less digits than its factorization.

82170111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1962.

The product of its (nonzero) digits is 112, while the sum is 21.

The square root of 82170111 is about 9064.7730804472. The cubic root of 82170111 is about 434.7483654969.

Adding to 82170111 its reverse (11107128), we get a palindrome (93277239).

The spelling of 82170111 in words is "eighty-two million, one hundred seventy thousand, one hundred eleven".