850171409 has 2 divisors, whose sum is σ = 850171410. Its totient is φ = 850171408.

The previous prime is 850171403. The next prime is 850171451. The reversal of 850171409 is 904171058.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 683038225 + 167133184 = 26135^2 + 12928^2 .

It is a cyclic number.

It is not a de Polignac number, because 850171409 - 2²⁸ = 581735953 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (850171403) 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, 425085704 + 425085705.

It is an arithmetic number, because the mean of its divisors is an integer number (425085705).

Almost surely, 2^850171409 is an apocalyptic number.

It is an amenable number.

850171409 is a deficient number, since it is larger than the sum of its proper divisors (1).

850171409 is an equidigital number, since it uses as much as digits as its factorization.

850171409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 850171409 is about 29157.6989661393. The cubic root of 850171409 is about 947.3319075342.

The spelling of 850171409 in words is "eight hundred fifty million, one hundred seventy-one thousand, four hundred nine".