851305 has 16 divisors (see below), whose sum is σ = 1257984. Its totient is φ = 538560.

The previous prime is 851303. The next prime is 851321. The reversal of 851305 is 503158.

It is not a de Polignac number, because 851305 - 2¹ = 851303 is a prime.

It is not an unprimeable number, because it can be changed into a prime (851303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 481 + ... + 1390.

It is an arithmetic number, because the mean of its divisors is an integer number (78624).

2⁸⁵¹³⁰⁵ is an apocalyptic number.

It is an amenable number.

851305 is a deficient number, since it is larger than the sum of its proper divisors (406679).

851305 is a wasteful number, since it uses less digits than its factorization.

851305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1896.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 851305 is about 922.6619099107. The cubic root of 851305 is about 94.7752767756.

It can be divided in two parts, 851 and 305, that added together give a square (1156 = 34²).

The spelling of 851305 in words is "eight hundred fifty-one thousand, three hundred five".