851864807 has 2 divisors, whose sum is σ = 851864808. Its totient is φ = 851864806.

The previous prime is 851864789. The next prime is 851864861. The reversal of 851864807 is 708468158.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 851864807 - 2⁶ = 851864743 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 (851861807) 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, 425932403 + 425932404.

It is an arithmetic number, because the mean of its divisors is an integer number (425932404).

Almost surely, 2^851864807 is an apocalyptic number.

851864807 is a deficient number, since it is larger than the sum of its proper divisors (1).

851864807 is an equidigital number, since it uses as much as digits as its factorization.

851864807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 430080, while the sum is 47.

The square root of 851864807 is about 29186.7231288475. The cubic root of 851864807 is about 947.9604654981.

The spelling of 851864807 in words is "eight hundred fifty-one million, eight hundred sixty-four thousand, eight hundred seven".