85867081 has 2 divisors, whose sum is σ = 85867082. Its totient is φ = 85867080.

The previous prime is 85867043. The next prime is 85867091. The reversal of 85867081 is 18076858.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54686025 + 31181056 = 7395^2 + 5584^2 .

It is a cyclic number.

It is not a de Polignac number, because 85867081 - 2¹³ = 85858889 is a prime.

It is a super-2 number, since 2×85867081² = 14746311198921122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (85867091) 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 as a sum of consecutive naturals, namely, 42933540 + 42933541.

It is an arithmetic number, because the mean of its divisors is an integer number (42933541).

Almost surely, 2^85867081 is an apocalyptic number.

It is an amenable number.

85867081 is a deficient number, since it is larger than the sum of its proper divisors (1).

85867081 is an equidigital number, since it uses as much as digits as its factorization.

85867081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 107520, while the sum is 43.

The square root of 85867081 is about 9266.4492120769. The cubic root of 85867081 is about 441.1729738993.

The spelling of 85867081 in words is "eighty-five million, eight hundred sixty-seven thousand, eighty-one".