12500009 has 4 divisors (see below), whose sum is σ = 12671316. Its totient is φ = 12328704.

The previous prime is 12500003. The next prime is 12500029. The reversal of 12500009 is 90000521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90000521 = 13 ⋅6923117.

It can be written as a sum of positive squares in 2 ways, for example, as 3667225 + 8832784 = 1915^2 + 2972^2 .

It is a cyclic number.

It is not a de Polignac number, because 12500009 - 2¹² = 12495913 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12500009.

It is not an unprimeable number, because it can be changed into a prime (12500003) 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, 85544 + ... + 85689.

It is an arithmetic number, because the mean of its divisors is an integer number (3167829).

Almost surely, 2^12500009 is an apocalyptic number.

It is an amenable number.

12500009 is a deficient number, since it is larger than the sum of its proper divisors (171307).

12500009 is an equidigital number, since it uses as much as digits as its factorization.

12500009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171306.

The product of its (nonzero) digits is 90, while the sum is 17.

The square root of 12500009 is about 3535.5351787247. The cubic root of 12500009 is about 232.0794973797.

The spelling of 12500009 in words is "twelve million, five hundred thousand, nine".