851803009 has 2 divisors, whose sum is σ = 851803010. Its totient is φ = 851803008.

The previous prime is 851802967. The next prime is 851803019. The reversal of 851803009 is 900308158.

851803009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 786241600 + 65561409 = 28040^2 + 8097^2 .

It is a cyclic number.

It is not a de Polignac number, because 851803009 - 2²³ = 843414401 is a prime.

It is a super-2 number, since 2×851803009² = 1451136732282908162, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (851803019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425901504 + 425901505.

It is an arithmetic number, because the mean of its divisors is an integer number (425901505).

Almost surely, 2^851803009 is an apocalyptic number.

It is an amenable number.

851803009 is a deficient number, since it is larger than the sum of its proper divisors (1).

851803009 is an equidigital number, since it uses as much as digits as its factorization.

851803009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 851803009 is about 29185.6644433530. The cubic root of 851803009 is about 947.9375418772.

The spelling of 851803009 in words is "eight hundred fifty-one million, eight hundred three thousand, nine".