12512909 has 4 divisors (see below), whose sum is σ = 12527904. Its totient is φ = 12497916.

The previous prime is 12512881. The next prime is 12512911. The reversal of 12512909 is 90921521.

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, and also an emirpimes, since its reverse is a distinct semiprime: 90921521 = 457 ⋅198953.

It is a cyclic number.

It is not a de Polignac number, because 12512909 - 2⁸ = 12512653 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 (12512939) 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, 6167 + ... + 7940.

It is an arithmetic number, because the mean of its divisors is an integer number (3131976).

Almost surely, 2^12512909 is an apocalyptic number.

It is an amenable number.

12512909 is a deficient number, since it is larger than the sum of its proper divisors (14995).

12512909 is an equidigital number, since it uses as much as digits as its factorization.

12512909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14994.

The product of its (nonzero) digits is 1620, while the sum is 29.

The square root of 12512909 is about 3537.3590431281. The cubic root of 12512909 is about 232.1593052217.

The spelling of 12512909 in words is "twelve million, five hundred twelve thousand, nine hundred nine".