851129 has 4 divisors (see below), whose sum is σ = 853620. Its totient is φ = 848640.

The previous prime is 851117. The next prime is 851131. The reversal of 851129 is 921158.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 577600 + 273529 = 760^2 + 523^2 .

It is a cyclic number.

It is not a de Polignac number, because 851129 - 2⁴ = 851113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 851098 and 851107.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 632 + ... + 1449.

It is an arithmetic number, because the mean of its divisors is an integer number (213405).

2⁸⁵¹¹²⁹ is an apocalyptic number.

It is an amenable number.

851129 is a deficient number, since it is larger than the sum of its proper divisors (2491).

851129 is a wasteful number, since it uses less digits than its factorization.

851129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2490.

The product of its digits is 720, while the sum is 26.

The square root of 851129 is about 922.5665287664. The cubic root of 851129 is about 94.7687450005.

The spelling of 851129 in words is "eight hundred fifty-one thousand, one hundred twenty-nine".