851020005 has 32 divisors (see below), whose sum is σ = 1488481920. Its totient is φ = 411764480.

The previous prime is 851020003. The next prime is 851020019. The reversal of 851020005 is 500020158.

851020005 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 851020005 - 2¹ = 851020003 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (851020003) 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, 78919 + ... + 89051.

It is an arithmetic number, because the mean of its divisors is an integer number (46515060).

Almost surely, 2^851020005 is an apocalyptic number.

It is an amenable number.

851020005 is a deficient number, since it is larger than the sum of its proper divisors (637461915).

851020005 is a wasteful number, since it uses less digits than its factorization.

851020005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10661.

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 851020005 is about 29172.2471708986. The cubic root of 851020005 is about 947.6469948747.

The spelling of 851020005 in words is "eight hundred fifty-one million, twenty thousand, five".