851921847 has 32 divisors (see below), whose sum is σ = 1448102400. Its totient is φ = 484890624.

The previous prime is 851921831. The next prime is 851921849. The reversal of 851921847 is 748129158.

It is not a de Polignac number, because 851921847 - 2⁴ = 851921831 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (851921849) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39804 + ... + 57342.

It is an arithmetic number, because the mean of its divisors is an integer number (45253200).

Almost surely, 2^851921847 is an apocalyptic number.

851921847 is a deficient number, since it is larger than the sum of its proper divisors (596180553).

851921847 is a wasteful number, since it uses less digits than its factorization.

851921847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17812 (or 17806 counting only the distinct ones).

The product of its digits is 161280, while the sum is 45.

The square root of 851921847 is about 29187.7002691202. The cubic root of 851921847 is about 947.9816231817.

The spelling of 851921847 in words is "eight hundred fifty-one million, nine hundred twenty-one thousand, eight hundred forty-seven".