13713209 has 4 divisors (see below), whose sum is σ = 13867380. Its totient is φ = 13559040.

The previous prime is 13713197. The next prime is 13713239. The reversal of 13713209 is 90231731.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5856400 + 7856809 = 2420^2 + 2803^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13713209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13713239) 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, 76952 + ... + 77129.

It is an arithmetic number, because the mean of its divisors is an integer number (3466845).

Almost surely, 2^13713209 is an apocalyptic number.

It is an amenable number.

13713209 is a deficient number, since it is larger than the sum of its proper divisors (154171).

13713209 is an equidigital number, since it uses as much as digits as its factorization.

13713209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154170.

The product of its (nonzero) digits is 1134, while the sum is 26.

The square root of 13713209 is about 3703.1350231932. The cubic root of 13713209 is about 239.3571278983.

The spelling of 13713209 in words is "thirteen million, seven hundred thirteen thousand, two hundred nine".