85850309 has 2 divisors, whose sum is σ = 85850310. Its totient is φ = 85850308.

The previous prime is 85850293. The next prime is 85850311. The reversal of 85850309 is 90305858.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53246209 + 32604100 = 7297^2 + 5710^2 .

It is a cyclic number.

It is not a de Polignac number, because 85850309 - 2⁴ = 85850293 is a prime.

Together with 85850311, 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 congruent number.

It is not a weakly prime, because it can be changed into another prime (85850399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42925154 + 42925155.

It is an arithmetic number, because the mean of its divisors is an integer number (42925155).

Almost surely, 2^85850309 is an apocalyptic number.

It is an amenable number.

85850309 is a deficient number, since it is larger than the sum of its proper divisors (1).

85850309 is an equidigital number, since it uses as much as digits as its factorization.

85850309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43200, while the sum is 38.

The square root of 85850309 is about 9265.5441826155. The cubic root of 85850309 is about 441.1442479706.

The spelling of 85850309 in words is "eighty-five million, eight hundred fifty thousand, three hundred nine".