85000081 has 2 divisors, whose sum is σ = 85000082. Its totient is φ = 85000080.

The previous prime is 85000067. The next prime is 85000103. The reversal of 85000081 is 18000058.

It is an a-pointer prime, because the next prime (85000103) can be obtained adding 85000081 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81450625 + 3549456 = 9025^2 + 1884^2 .

It is a cyclic number.

It is not a de Polignac number, because 85000081 - 2²¹ = 82902929 is a prime.

It is a super-2 number, since 2×85000081² = 14450027540013122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (85000021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42500040 + 42500041.

It is an arithmetic number, because the mean of its divisors is an integer number (42500041).

Almost surely, 2^85000081 is an apocalyptic number.

It is an amenable number.

85000081 is a deficient number, since it is larger than the sum of its proper divisors (1).

85000081 is an equidigital number, since it uses as much as digits as its factorization.

85000081 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 85000081 is about 9219.5488501336. The cubic root of 85000081 is about 439.6831068798.

The spelling of 85000081 in words is "eighty-five million, eighty-one", and thus it is an aban number and an uban number.