12900509 has 4 divisors (see below), whose sum is σ = 12921216. Its totient is φ = 12879804.

The previous prime is 12900491. The next prime is 12900521. The reversal of 12900509 is 90500921.

It is a happy number.

12900509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a cyclic number.

It is not a de Polignac number, because 12900509 - 2²⁰ = 11851933 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 (12900529) 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, 9389 + ... + 10674.

It is an arithmetic number, because the mean of its divisors is an integer number (3230304).

Almost surely, 2^12900509 is an apocalyptic number.

It is an amenable number.

12900509 is a deficient number, since it is larger than the sum of its proper divisors (20707).

12900509 is an equidigital number, since it uses as much as digits as its factorization.

12900509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20706.

The product of its (nonzero) digits is 810, while the sum is 26.

The square root of 12900509 is about 3591.7278571740. The cubic root of 12900509 is about 234.5320944793.

The spelling of 12900509 in words is "twelve million, nine hundred thousand, five hundred nine".