818109 has 6 divisors (see below), whose sum is σ = 1181726. Its totient is φ = 545400.

The previous prime is 818101. The next prime is 818113. The reversal of 818109 is 901818.

It can be written as a sum of positive squares in only one way, i.e., 558009 + 260100 = 747^2 + 510^2 .

It is not a de Polignac number, because 818109 - 2³ = 818101 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (818101) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 45442 + ... + 45459.

2⁸¹⁸¹⁰⁹ is an apocalyptic number.

It is an amenable number.

818109 is a deficient number, since it is larger than the sum of its proper divisors (363617).

818109 is a wasteful number, since it uses less digits than its factorization.

818109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90907 (or 90904 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 27.

The square root of 818109 is about 904.4937810731. The cubic root of 818109 is about 93.5270113653.

The spelling of 818109 in words is "eight hundred eighteen thousand, one hundred nine".