85216829 has 2 divisors, whose sum is σ = 85216830. Its totient is φ = 85216828.

The previous prime is 85216823. The next prime is 85216849. The reversal of 85216829 is 92861258.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77404804 + 7812025 = 8798^2 + 2795^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85216829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85216823) 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, 42608414 + 42608415.

It is an arithmetic number, because the mean of its divisors is an integer number (42608415).

Almost surely, 2^85216829 is an apocalyptic number.

It is an amenable number.

85216829 is a deficient number, since it is larger than the sum of its proper divisors (1).

85216829 is an equidigital number, since it uses as much as digits as its factorization.

85216829 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69120, while the sum is 41.

The square root of 85216829 is about 9231.2961711777. The cubic root of 85216829 is about 440.0565165007.

The spelling of 85216829 in words is "eighty-five million, two hundred sixteen thousand, eight hundred twenty-nine".