12131109 has 6 divisors (see below), whose sum is σ = 17522726. Its totient is φ = 8087400.

The previous prime is 12131099. The next prime is 12131113. The reversal of 12131109 is 90113121.

12131109 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 9641025 + 2490084 = 3105^2 + 1578^2 .

It is not a de Polignac number, because 12131109 - 2⁷ = 12130981 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12131091 and 12131100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12131159) 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, 673942 + ... + 673959.

Almost surely, 2^12131109 is an apocalyptic number.

It is an amenable number.

12131109 is a deficient number, since it is larger than the sum of its proper divisors (5391617).

12131109 is a wasteful number, since it uses less digits than its factorization.

12131109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1347907 (or 1347904 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 18.

The square root of 12131109 is about 3482.9741601109. The cubic root of 12131109 is about 229.7736209884.

The spelling of 12131109 in words is "twelve million, one hundred thirty-one thousand, one hundred nine".