82097181 has 6 divisors (see below), whose sum is σ = 118584830. Its totient is φ = 54731448.

The previous prime is 82097167. The next prime is 82097219. The reversal of 82097181 is 18179028.

It can be written as a sum of positive squares in only one way, i.e., 81812025 + 285156 = 9045^2 + 534^2 .

It is not a de Polignac number, because 82097181 - 2⁹ = 82096669 is a prime.

It is a super-2 number, since 2×82097181² = 13479894256293522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82097111) 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 5 ways as a sum of consecutive naturals, for example, 4560946 + ... + 4560963.

Almost surely, 2^82097181 is an apocalyptic number.

It is an amenable number.

82097181 is a deficient number, since it is larger than the sum of its proper divisors (36487649).

82097181 is a wasteful number, since it uses less digits than its factorization.

82097181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9121915 (or 9121912 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The square root of 82097181 is about 9060.7494723119. The cubic root of 82097181 is about 434.6197072666.

The spelling of 82097181 in words is "eighty-two million, ninety-seven thousand, one hundred eighty-one".