82085281 has 4 divisors (see below), whose sum is σ = 82109572. Its totient is φ = 82060992.

The previous prime is 82085273. The next prime is 82085291. The reversal of 82085281 is 18258028.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 42458256 + 39627025 = 6516^2 + 6295^2 .

It is a cyclic number.

It is not a de Polignac number, because 82085281 - 2³ = 82085273 is a prime.

It is a super-2 number, since 2×82085281² = 13475986713697922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82085221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6060 + ... + 14173.

It is an arithmetic number, because the mean of its divisors is an integer number (20527393).

Almost surely, 2^82085281 is an apocalyptic number.

It is an amenable number.

82085281 is a deficient number, since it is larger than the sum of its proper divisors (24291).

82085281 is a wasteful number, since it uses less digits than its factorization.

82085281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24290.

The product of its (nonzero) digits is 10240, while the sum is 34.

The square root of 82085281 is about 9060.0927699445. The cubic root of 82085281 is about 434.5987068523.

The spelling of 82085281 in words is "eighty-two million, eighty-five thousand, two hundred eighty-one".