851189 has 4 divisors (see below), whose sum is σ = 853920. Its totient is φ = 848460.

The previous prime is 851177. The next prime is 851197. The reversal of 851189 is 981158.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 981158 = 2 ⋅490579.

It is a cyclic number.

It is not a de Polignac number, because 851189 - 2⁸ = 850933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (851159) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 827 + ... + 1544.

It is an arithmetic number, because the mean of its divisors is an integer number (213480).

2⁸⁵¹¹⁸⁹ is an apocalyptic number.

It is an amenable number.

851189 is a deficient number, since it is larger than the sum of its proper divisors (2731).

851189 is a wasteful number, since it uses less digits than its factorization.

851189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2730.

The product of its digits is 2880, while the sum is 32.

The square root of 851189 is about 922.5990461734. The cubic root of 851189 is about 94.7709718431.

The spelling of 851189 in words is "eight hundred fifty-one thousand, one hundred eighty-nine".