851089 has 4 divisors (see below), whose sum is σ = 859456. Its totient is φ = 842724.

The previous prime is 851087. The next prime is 851093. The reversal of 851089 is 980158.

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.

It is a 6-Lehmer number, since φ(851089) divides (851089-1)⁶.

It is a cyclic number.

It is not a de Polignac number, because 851089 - 2¹ = 851087 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 851089.

It is not an unprimeable number, because it can be changed into a prime (851087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4029 + ... + 4234.

It is an arithmetic number, because the mean of its divisors is an integer number (214864).

2⁸⁵¹⁰⁸⁹ is an apocalyptic number.

It is an amenable number.

851089 is a deficient number, since it is larger than the sum of its proper divisors (8367).

851089 is a wasteful number, since it uses less digits than its factorization.

851089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8366.

The product of its (nonzero) digits is 2880, while the sum is 31.

The square root of 851089 is about 922.5448498583. The cubic root of 851089 is about 94.7672603806.

The spelling of 851089 in words is "eight hundred fifty-one thousand, eighty-nine".