82161217 has 8 divisors (see below), whose sum is σ = 85334400. Its totient is φ = 79047504.

The previous prime is 82161203. The next prime is 82161241. The reversal of 82161217 is 71216128.

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 82161217 - 2²³ = 73772609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82161517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12042 + ... + 17587.

It is an arithmetic number, because the mean of its divisors is an integer number (10666800).

Almost surely, 2^82161217 is an apocalyptic number.

It is an amenable number.

82161217 is a deficient number, since it is larger than the sum of its proper divisors (3173183).

82161217 is a wasteful number, since it uses less digits than its factorization.

82161217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29735.

The product of its digits is 1344, while the sum is 28.

The square root of 82161217 is about 9064.2824867719. The cubic root of 82161217 is about 434.7326793736.

It can be divided in two parts, 8216121 and 7, that added together give a palindrome (8216128).

The spelling of 82161217 in words is "eighty-two million, one hundred sixty-one thousand, two hundred seventeen".