851791005 has 32 divisors (see below), whose sum is σ = 1630782720. Its totient is φ = 419342400.

The previous prime is 851790997. The next prime is 851791013. The reversal of 851791005 is 500197158.

851791005 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (851790997) and next prime (851791013).

It is not a de Polignac number, because 851791005 - 2³ = 851790997 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 240921 + ... + 244430.

It is an arithmetic number, because the mean of its divisors is an integer number (50961960).

Almost surely, 2^851791005 is an apocalyptic number.

It is an amenable number.

851791005 is a deficient number, since it is larger than the sum of its proper divisors (778991715).

851791005 is a wasteful number, since it uses less digits than its factorization.

851791005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485378 (or 485372 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 36.

The square root of 851791005 is about 29185.4587937212. The cubic root of 851791005 is about 947.9330889323.

The spelling of 851791005 in words is "eight hundred fifty-one million, seven hundred ninety-one thousand, five".