13425209 has 4 divisors (see below), whose sum is σ = 15343104. Its totient is φ = 11507316.

The previous prime is 13425187. The next prime is 13425233. The reversal of 13425209 is 90252431.

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: 90252431 = 71 ⋅1271161.

It is a cyclic number.

It is not a de Polignac number, because 13425209 - 2¹⁶ = 13359673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13425239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 958937 + ... + 958950.

It is an arithmetic number, because the mean of its divisors is an integer number (3835776).

Almost surely, 2^13425209 is an apocalyptic number.

It is an amenable number.

13425209 is a deficient number, since it is larger than the sum of its proper divisors (1917895).

13425209 is an equidigital number, since it uses as much as digits as its factorization.

13425209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1917894.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 13425209 is about 3664.0427126331. The cubic root of 13425209 is about 237.6696272964.

The spelling of 13425209 in words is "thirteen million, four hundred twenty-five thousand, two hundred nine".