85216361 has 2 divisors, whose sum is σ = 85216362. Its totient is φ = 85216360.

The previous prime is 85216321. The next prime is 85216363. The reversal of 85216361 is 16361258.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79995136 + 5221225 = 8944^2 + 2285^2 .

It is a cyclic number.

It is not a de Polignac number, because 85216361 - 2¹⁰ = 85215337 is a prime.

It is a Sophie Germain prime.

Together with 85216363, it forms a pair of twin primes.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (85216363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42608180 + 42608181.

It is an arithmetic number, because the mean of its divisors is an integer number (42608181).

Almost surely, 2^85216361 is an apocalyptic number.

It is an amenable number.

85216361 is a deficient number, since it is larger than the sum of its proper divisors (1).

85216361 is an equidigital number, since it uses as much as digits as its factorization.

85216361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 32.

The square root of 85216361 is about 9231.2708225899. The cubic root of 85216361 is about 440.0557109210.

The spelling of 85216361 in words is "eighty-five million, two hundred sixteen thousand, three hundred sixty-one".