850842389 has 2 divisors, whose sum is σ = 850842390. Its totient is φ = 850842388.

The previous prime is 850842361. The next prime is 850842413. The reversal of 850842389 is 983248058.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 695640625 + 155201764 = 26375^2 + 12458^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-850842389 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (850842329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425421194 + 425421195.

It is an arithmetic number, because the mean of its divisors is an integer number (425421195).

Almost surely, 2^850842389 is an apocalyptic number.

It is an amenable number.

850842389 is a deficient number, since it is larger than the sum of its proper divisors (1).

850842389 is an equidigital number, since it uses as much as digits as its factorization.

850842389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 552960, while the sum is 47.

The square root of 850842389 is about 29169.2027487897. The cubic root of 850842389 is about 947.5810626292.

The spelling of 850842389 in words is "eight hundred fifty million, eight hundred forty-two thousand, three hundred eighty-nine".