851995 has 8 divisors (see below), whose sum is σ = 1035216. Its totient is φ = 673056.

The previous prime is 851971. The next prime is 852011. The reversal of 851995 is 599158.

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

It is a cyclic number.

It is not a de Polignac number, because 851995 - 2¹⁹ = 327707 is a prime.

It is a Duffinian number.

851995 is a lucky number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 612 + ... + 1441.

It is an arithmetic number, because the mean of its divisors is an integer number (129402).

2⁸⁵¹⁹⁹⁵ is an apocalyptic number.

851995 is a deficient number, since it is larger than the sum of its proper divisors (183221).

851995 is a wasteful number, since it uses less digits than its factorization.

851995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2141.

The product of its digits is 16200, while the sum is 37.

The square root of 851995 is about 923.0357522870. The cubic root of 851995 is about 94.8008756232.

It can be divided in two parts, 85 and 1995, that added together give a triangular number (2080 = T₆₄).

The spelling of 851995 in words is "eight hundred fifty-one thousand, nine hundred ninety-five".