13261609 has 4 divisors (see below), whose sum is σ = 13330516. Its totient is φ = 13192704.

The previous prime is 13261579. The next prime is 13261621. The reversal of 13261609 is 90616231.

13261609 = T₂₇₀ + T₂₇₁ + ... + T₄₆₂.

13261609 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 4243600 + 9018009 = 2060^2 + 3003^2 .

It is a cyclic number.

It is not a de Polignac number, because 13261609 - 2⁷ = 13261481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13261669) 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, 34164 + ... + 34549.

It is an arithmetic number, because the mean of its divisors is an integer number (3332629).

Almost surely, 2^13261609 is an apocalyptic number.

It is an amenable number.

13261609 is a deficient number, since it is larger than the sum of its proper divisors (68907).

13261609 is an equidigital number, since it uses as much as digits as its factorization.

13261609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68906.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 13261609 is about 3641.6492142984. The cubic root of 13261609 is about 236.7002625939.

The spelling of 13261609 in words is "thirteen million, two hundred sixty-one thousand, six hundred nine".