918109 has 2 divisors, whose sum is σ = 918110. Its totient is φ = 918108.

The previous prime is 918103. The next prime is 918131. The reversal of 918109 is 901819.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 912025 + 6084 = 955^2 + 78^2 .

It is an emirp because it is prime and its reverse (901819) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 918109 - 2¹¹ = 916061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (918103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 459054 + 459055.

It is an arithmetic number, because the mean of its divisors is an integer number (459055).

2⁹¹⁸¹⁰⁹ is an apocalyptic number.

It is an amenable number.

918109 is a deficient number, since it is larger than the sum of its proper divisors (1).

918109 is an equidigital number, since it uses as much as digits as its factorization.

918109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 28.

The square root of 918109 is about 958.1800457117. The cubic root of 918109 is about 97.1922004840.

Subtracting from 918109 its reverse (901819), we obtain a triangular number (16290 = T₁₈₀).

It can be divided in two parts, 91810 and 9, that added together give a palindrome (91819).

The spelling of 918109 in words is "nine hundred eighteen thousand, one hundred nine".