850009 has 2 divisors, whose sum is σ = 850010. Its totient is φ = 850008.

The previous prime is 849997. The next prime is 850021. The reversal of 850009 is 900058.

It is a balanced prime because it is at equal distance from previous prime (849997) and next prime (850021).

It can be written as a sum of positive squares in only one way, i.e., 455625 + 394384 = 675^2 + 628^2 .

It is a cyclic number.

It is not a de Polignac number, because 850009 - 2¹⁷ = 718937 is a prime.

It is not a weakly prime, because it can be changed into another prime (850049) 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, 425004 + 425005.

It is an arithmetic number, because the mean of its divisors is an integer number (425005).

2⁸⁵⁰⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

850009 is a deficient number, since it is larger than the sum of its proper divisors (1).

850009 is an equidigital number, since it uses as much as digits as its factorization.

850009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 850009 is about 921.9593266517. The cubic root of 850009 is about 94.7271580474.

The spelling of 850009 in words is "eight hundred fifty thousand, nine".