85081 has 2 divisors, whose sum is σ = 85082. Its totient is φ = 85080.

The previous prime is 85061. The next prime is 85087. The reversal of 85081 is 18058.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84681 + 400 = 291^2 + 20^2 .

It is a cyclic number.

It is not a de Polignac number, because 85081 - 2⁵ = 85049 is a prime.

It is a super-2 number, since 2×85081² = 14477553122, which contains 22 as substring.

It is equal to p₈₂₈₄ and since 85081 and 8284 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (85087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42540 + 42541.

It is an arithmetic number, because the mean of its divisors is an integer number (42541).

2⁸⁵⁰⁸¹ is an apocalyptic number.

It is an amenable number.

85081 is a deficient number, since it is larger than the sum of its proper divisors (1).

85081 is an equidigital number, since it uses as much as digits as its factorization.

85081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 320, while the sum is 22.

The square root of 85081 is about 291.6864755178. The cubic root of 85081 is about 43.9822586877.

The spelling of 85081 in words is "eighty-five thousand, eighty-one".