806129165 has 4 divisors (see below), whose sum is σ = 967355004. Its totient is φ = 644903328.

The previous prime is 806129161. The next prime is 806129173. The reversal of 806129165 is 561921608.

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 159037321 + 647091844 = 12611^2 + 25438^2 .

It is a cyclic number.

It is not a de Polignac number, because 806129165 - 2² = 806129161 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (806129161) 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, 80612912 + ... + 80612921.

It is an arithmetic number, because the mean of its divisors is an integer number (241838751).

Almost surely, 2^806129165 is an apocalyptic number.

It is an amenable number.

806129165 is a deficient number, since it is larger than the sum of its proper divisors (161225839).

806129165 is a wasteful number, since it uses less digits than its factorization.

806129165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161225838.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 806129165 is about 28392.4138635657. The cubic root of 806129165 is about 930.6824932010.

The spelling of 806129165 in words is "eight hundred six million, one hundred twenty-nine thousand, one hundred sixty-five".