82161861 has 8 divisors (see below), whose sum is σ = 109661760. Its totient is φ = 54718272.

The previous prime is 82161853. The next prime is 82161869. The reversal of 82161861 is 16816128.

It is an interprime number because it is at equal distance from previous prime (82161853) and next prime (82161869).

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

It is not a de Polignac number, because 82161861 - 2³ = 82161853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82161869) 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, 10545 + ... + 16598.

It is an arithmetic number, because the mean of its divisors is an integer number (13707720).

Almost surely, 2^82161861 is an apocalyptic number.

It is an amenable number.

82161861 is a deficient number, since it is larger than the sum of its proper divisors (27499899).

82161861 is a wasteful number, since it uses less digits than its factorization.

82161861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28155.

The product of its digits is 4608, while the sum is 33.

The square root of 82161861 is about 9064.3180107496. The cubic root of 82161861 is about 434.7338152181.

Adding to 82161861 its reverse (16816128), we get a palindrome (98977989).

The spelling of 82161861 in words is "eighty-two million, one hundred sixty-one thousand, eight hundred sixty-one".