12512109 has 4 divisors (see below), whose sum is σ = 16682816. Its totient is φ = 8341404.

The previous prime is 12512107. The next prime is 12512111. The reversal of 12512109 is 90121521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (12512107) and next prime (12512111).

It is not a de Polignac number, because 12512109 - 2¹ = 12512107 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 (12512107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2085349 + ... + 2085354.

It is an arithmetic number, because the mean of its divisors is an integer number (4170704).

Almost surely, 2^12512109 is an apocalyptic number.

It is an amenable number.

12512109 is a deficient number, since it is larger than the sum of its proper divisors (4170707).

12512109 is an equidigital number, since it uses as much as digits as its factorization.

12512109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4170706.

The product of its (nonzero) digits is 180, while the sum is 21.

The square root of 12512109 is about 3537.2459626099. The cubic root of 12512109 is about 232.1543574939.

It can be divided in two parts, 12512 and 109, that added together give a palindrome (12621).

The spelling of 12512109 in words is "twelve million, five hundred twelve thousand, one hundred nine".