13209091 has 4 divisors (see below), whose sum is σ = 15096112. Its totient is φ = 11322072.

The previous prime is 13209089. The next prime is 13209101. The reversal of 13209091 is 19090231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19090231 = 19 ⋅1004749.

It is a cyclic number.

It is not a de Polignac number, because 13209091 - 2¹ = 13209089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13209191) 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, 943500 + ... + 943513.

It is an arithmetic number, because the mean of its divisors is an integer number (3774028).

Almost surely, 2^13209091 is an apocalyptic number.

13209091 is a deficient number, since it is larger than the sum of its proper divisors (1887021).

13209091 is an equidigital number, since it uses as much as digits as its factorization.

13209091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1887020.

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 13209091 is about 3634.4313172765. The cubic root of 13209091 is about 236.3873928112.

The spelling of 13209091 in words is "thirteen million, two hundred nine thousand, ninety-one".