12345109 has 6 divisors (see below), whose sum is σ = 14360694. Its totient is φ = 10581480.

The previous prime is 12345083. The next prime is 12345121. The reversal of 12345109 is 90154321.

It can be written as a sum of positive squares in only one way, i.e., 11242609 + 1102500 = 3353^2 + 1050^2 .

It is not a de Polignac number, because 12345109 - 2²³ = 3956501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12345149) 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, 125922 + ... + 126019.

It is an arithmetic number, because the mean of its divisors is an integer number (2393449).

Almost surely, 2^12345109 is an apocalyptic number.

It is an amenable number.

12345109 is a deficient number, since it is larger than the sum of its proper divisors (2015585).

12345109 is an equidigital number, since it uses as much as digits as its factorization.

12345109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251955 (or 251948 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 12345109 is about 3513.5607295164. The cubic root of 12345109 is about 231.1168677084.

The spelling of 12345109 in words is "twelve million, three hundred forty-five thousand, one hundred nine".