850861199 has 2 divisors, whose sum is σ = 850861200. Its totient is φ = 850861198.

The previous prime is 850861153. The next prime is 850861201. The reversal of 850861199 is 991168058.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-850861199 is a prime.

Together with 850861201, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (850861129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425430599 + 425430600.

It is an arithmetic number, because the mean of its divisors is an integer number (425430600).

Almost surely, 2^850861199 is an apocalyptic number.

850861199 is a deficient number, since it is larger than the sum of its proper divisors (1).

850861199 is an equidigital number, since it uses as much as digits as its factorization.

850861199 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 47.

The square root of 850861199 is about 29169.5251761149. The cubic root of 850861199 is about 947.5880454612.

The spelling of 850861199 in words is "eight hundred fifty million, eight hundred sixty-one thousand, one hundred ninety-nine".