9138109 has 4 divisors (see below), whose sum is σ = 9145116. Its totient is φ = 9131104.

The previous prime is 9138091. The next prime is 9138119. The reversal of 9138109 is 9018319.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9018319 = 41 ⋅219959.

It can be written as a sum of positive squares in 2 ways, for example, as 4284900 + 4853209 = 2070^2 + 2203^2 .

It is a cyclic number.

It is not a de Polignac number, because 9138109 - 2⁷ = 9137981 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9138119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 904 + ... + 4369.

It is an arithmetic number, because the mean of its divisors is an integer number (2286279).

Almost surely, 2^9138109 is an apocalyptic number.

It is an amenable number.

9138109 is a deficient number, since it is larger than the sum of its proper divisors (7007).

9138109 is a wasteful number, since it uses less digits than its factorization.

9138109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7006.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 9138109 is about 3022.9305317853. The cubic root of 9138109 is about 209.0669794405.

The spelling of 9138109 in words is "nine million, one hundred thirty-eight thousand, one hundred nine".