851191867 has 4 divisors (see below), whose sum is σ = 852541456. Its totient is φ = 849842280.

The previous prime is 851191841. The next prime is 851191883. The reversal of 851191867 is 768191158.

851191867 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-851191867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (851111867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 673848 + ... + 675109.

It is an arithmetic number, because the mean of its divisors is an integer number (213135364).

Almost surely, 2^851191867 is an apocalyptic number.

851191867 is a deficient number, since it is larger than the sum of its proper divisors (1349589).

851191867 is a wasteful number, since it uses less digits than its factorization.

851191867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1349588.

The product of its digits is 120960, while the sum is 46.

The square root of 851191867 is about 29175.1926643167. The cubic root of 851191867 is about 947.7107824648.

The spelling of 851191867 in words is "eight hundred fifty-one million, one hundred ninety-one thousand, eight hundred sixty-seven".