85581271 has 2 divisors, whose sum is σ = 85581272. Its totient is φ = 85581270.

The previous prime is 85581203. The next prime is 85581277. The reversal of 85581271 is 17218558.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85581271 - 2¹¹ = 85579223 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 85581271.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85581277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42790635 + 42790636.

It is an arithmetic number, because the mean of its divisors is an integer number (42790636).

Almost surely, 2^85581271 is an apocalyptic number.

85581271 is a deficient number, since it is larger than the sum of its proper divisors (1).

85581271 is an equidigital number, since it uses as much as digits as its factorization.

85581271 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22400, while the sum is 37.

The square root of 85581271 is about 9251.0145930055. The cubic root of 85581271 is about 440.6829459597.

The spelling of 85581271 in words is "eighty-five million, five hundred eighty-one thousand, two hundred seventy-one".