12509105 has 16 divisors (see below), whose sum is σ = 17238144. Its totient is φ = 8536320.

The previous prime is 12509099. The next prime is 12509117. The reversal of 12509105 is 50190521.

It is not a de Polignac number, because 12509105 - 2¹⁰ = 12508081 is a prime.

It is a Curzon number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 7694 + ... + 9176.

It is an arithmetic number, because the mean of its divisors is an integer number (1077384).

Almost surely, 2^12509105 is an apocalyptic number.

It is an amenable number.

12509105 is a deficient number, since it is larger than the sum of its proper divisors (4729039).

12509105 is a wasteful number, since it uses less digits than its factorization.

12509105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1736.

The product of its (nonzero) digits is 450, while the sum is 23.

The square root of 12509105 is about 3536.8213129871. The cubic root of 12509105 is about 232.1357768931.

Adding to 12509105 its reverse (50190521), we get a palindrome (62699626).

It can be divided in two parts, 12 and 509105, that multiplied together give a triangular number (6109260 = T₃₄₉₅).

The spelling of 12509105 in words is "twelve million, five hundred nine thousand, one hundred five".