850081009 has 2 divisors, whose sum is σ = 850081010. Its totient is φ = 850081008.

The previous prime is 850080983. The next prime is 850081013. The reversal of 850081009 is 900180058.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 522579600 + 327501409 = 22860^2 + 18097^2 .

It is a cyclic number.

It is not a de Polignac number, because 850081009 - 2¹⁷ = 849949937 is a prime.

It is not a weakly prime, because it can be changed into another prime (850081709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425040504 + 425040505.

It is an arithmetic number, because the mean of its divisors is an integer number (425040505).

Almost surely, 2^850081009 is an apocalyptic number.

It is an amenable number.

850081009 is a deficient number, since it is larger than the sum of its proper divisors (1).

850081009 is an equidigital number, since it uses as much as digits as its factorization.

850081009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 31.

The square root of 850081009 is about 29156.1487340149. The cubic root of 850081009 is about 947.2983292702.

The spelling of 850081009 in words is "eight hundred fifty million, eighty-one thousand, nine".