85811471 has 2 divisors, whose sum is σ = 85811472. Its totient is φ = 85811470.

The previous prime is 85811417. The next prime is 85811477. The reversal of 85811471 is 17411858.

Together with previous prime (85811417) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85811471 is a prime.

It is a super-3 number, since 3×85811471³ (a number of 25 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is equal to p_4988150 and since 85811471 and 4988150 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85811477) 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, 42905735 + 42905736.

It is an arithmetic number, because the mean of its divisors is an integer number (42905736).

Almost surely, 2^85811471 is an apocalyptic number.

85811471 is a deficient number, since it is larger than the sum of its proper divisors (1).

85811471 is an equidigital number, since it uses as much as digits as its factorization.

85811471 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8960, while the sum is 35.

The square root of 85811471 is about 9263.4481161175. The cubic root of 85811471 is about 441.0777145483.

The spelling of 85811471 in words is "eighty-five million, eight hundred eleven thousand, four hundred seventy-one".