810099 has 6 divisors (see below), whose sum is σ = 1170156. Its totient is φ = 540060.

The previous prime is 810091. The next prime is 810109. The reversal of 810099 is 990018.

It is not a de Polignac number, because 810099 - 2³ = 810091 is a prime.

810099 is a modest number, since divided by 99 gives 81 as remainder.

It is not an unprimeable number, because it can be changed into a prime (810091) 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 5 ways as a sum of consecutive naturals, for example, 44997 + ... + 45014.

It is an arithmetic number, because the mean of its divisors is an integer number (195026).

2⁸¹⁰⁰⁹⁹ is an apocalyptic number.

810099 is a deficient number, since it is larger than the sum of its proper divisors (360057).

810099 is a wasteful number, since it uses less digits than its factorization.

810099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90017 (or 90014 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 810099 is about 900.0549983195. The cubic root of 810099 is about 93.2207727525.

It can be divided in two parts, 81009 and 9, that added together give a palindrome (81018).

The spelling of 810099 in words is "eight hundred ten thousand, ninety-nine".