851365 has 8 divisors (see below), whose sum is σ = 1046808. Its totient is φ = 664320.

The previous prime is 851363. The next prime is 851381. The reversal of 851365 is 563158.

It can be written as a sum of positive squares in 4 ways, for example, as 73441 + 777924 = 271^2 + 882^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 851365 - 2¹ = 851363 is a prime.

It is a Duffinian number.

851365 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (851363) 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 7 ways as a sum of consecutive naturals, for example, 1872 + ... + 2281.

It is an arithmetic number, because the mean of its divisors is an integer number (130851).

2⁸⁵¹³⁶⁵ is an apocalyptic number.

It is an amenable number.

851365 is a deficient number, since it is larger than the sum of its proper divisors (195443).

851365 is a wasteful number, since it uses less digits than its factorization.

851365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4199.

The product of its digits is 3600, while the sum is 28.

The square root of 851365 is about 922.6944239563. The cubic root of 851365 is about 94.7775033113. Note that the first 3 decimals are identical.

The spelling of 851365 in words is "eight hundred fifty-one thousand, three hundred sixty-five".