82016581 has 2 divisors, whose sum is σ = 82016582. Its totient is φ = 82016580.

The previous prime is 82016569. The next prime is 82016587. The reversal of 82016581 is 18561028.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74909025 + 7107556 = 8655^2 + 2666^2 .

It is a cyclic number.

It is not a de Polignac number, because 82016581 - 2¹⁷ = 81885509 is a prime.

It is a super-2 number, since 2×82016581² = 13453439117859122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82016587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41008290 + 41008291.

It is an arithmetic number, because the mean of its divisors is an integer number (41008291).

Almost surely, 2^82016581 is an apocalyptic number.

It is an amenable number.

82016581 is a deficient number, since it is larger than the sum of its proper divisors (1).

82016581 is an equidigital number, since it uses as much as digits as its factorization.

82016581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3840, while the sum is 31.

The square root of 82016581 is about 9056.3006244272. The cubic root of 82016581 is about 434.4774294682.

The spelling of 82016581 in words is "eighty-two million, sixteen thousand, five hundred eighty-one".