13223509 has 4 divisors (see below), whose sum is σ = 14240716. Its totient is φ = 12206304.

The previous prime is 13223473. The next prime is 13223527. The reversal of 13223509 is 90532231.

It is a happy number.

13223509 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.

It can be written as a sum of positive squares in 2 ways, for example, as 4796100 + 8427409 = 2190^2 + 2903^2 .

It is a cyclic number.

It is not a de Polignac number, because 13223509 - 2¹⁷ = 13092437 is a prime.

It is a super-2 number, since 2×13223509² = 349722380546162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13223549) 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, 508584 + ... + 508609.

It is an arithmetic number, because the mean of its divisors is an integer number (3560179).

Almost surely, 2^13223509 is an apocalyptic number.

It is an amenable number.

13223509 is a deficient number, since it is larger than the sum of its proper divisors (1017207).

13223509 is a wasteful number, since it uses less digits than its factorization.

13223509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1017206.

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 13223509 is about 3636.4143053288. The cubic root of 13223509 is about 236.4733688038.

The spelling of 13223509 in words is "thirteen million, two hundred twenty-three thousand, five hundred nine".