805129 has 4 divisors (see below), whose sum is σ = 867076. Its totient is φ = 743184.

The previous prime is 805121. The next prime is 805153. The reversal of 805129 is 921508.

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 227529 + 577600 = 477^2 + 760^2 .

It is not a de Polignac number, because 805129 - 2³ = 805121 is a prime.

It is a Duffinian number.

805129 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (805121) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 30954 + ... + 30979.

It is an arithmetic number, because the mean of its divisors is an integer number (216769).

2⁸⁰⁵¹²⁹ is an apocalyptic number.

It is an amenable number.

805129 is a deficient number, since it is larger than the sum of its proper divisors (61947).

805129 is a wasteful number, since it uses less digits than its factorization.

805129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61946.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 805129 is about 897.2898082560. The cubic root of 805129 is about 93.0297434443.

The spelling of 805129 in words is "eight hundred five thousand, one hundred twenty-nine".