13139209 has 4 divisors (see below), whose sum is σ = 13444816. Its totient is φ = 12833604.

The previous prime is 13139171. The next prime is 13139213. The reversal of 13139209 is 90293131.

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: 90293131 = 283 ⋅319057.

It is a cyclic number.

It is not a de Polignac number, because 13139209 - 2¹³ = 13131017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13139219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 152739 + ... + 152824.

It is an arithmetic number, because the mean of its divisors is an integer number (3361204).

Almost surely, 2^13139209 is an apocalyptic number.

It is an amenable number.

13139209 is a deficient number, since it is larger than the sum of its proper divisors (305607).

13139209 is an equidigital number, since it uses as much as digits as its factorization.

13139209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305606.

The product of its (nonzero) digits is 1458, while the sum is 28.

The square root of 13139209 is about 3624.8046843934. The cubic root of 13139209 is about 235.9697904930.

It can be divided in two parts, 131 and 39209, that added together give a triangular number (39340 = T₂₈₀).

The spelling of 13139209 in words is "thirteen million, one hundred thirty-nine thousand, two hundred nine".