82081861 has 8 divisors (see below), whose sum is σ = 85029120. Its totient is φ = 79142448.

The previous prime is 82081859. The next prime is 82081891. The reversal of 82081861 is 16818028.

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 82081861 - 2¹ = 82081859 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 (82081841) 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, 26580 + ... + 29506.

It is an arithmetic number, because the mean of its divisors is an integer number (10628640).

Almost surely, 2^82081861 is an apocalyptic number.

It is an amenable number.

82081861 is a deficient number, since it is larger than the sum of its proper divisors (2947259).

82081861 is a wasteful number, since it uses less digits than its factorization.

82081861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3923.

The product of its (nonzero) digits is 6144, while the sum is 34.

The square root of 82081861 is about 9059.9040281893. The cubic root of 82081861 is about 434.5926710637.

Adding to 82081861 its reverse (16818028), we get a palindrome (98899889).

The spelling of 82081861 in words is "eighty-two million, eighty-one thousand, eight hundred sixty-one".