13791609 has 12 divisors (see below), whose sum is σ = 21453796. Its totient is φ = 8487072.

The previous prime is 13791601. The next prime is 13791611. The reversal of 13791609 is 90619731.

It can be written as a sum of positive squares in 2 ways, for example, as 810000 + 12981609 = 900^2 + 3603^2 .

It is not a de Polignac number, because 13791609 - 2³ = 13791601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13791601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 58822 + ... + 59055.

Almost surely, 2^13791609 is an apocalyptic number.

It is an amenable number.

13791609 is a deficient number, since it is larger than the sum of its proper divisors (7662187).

13791609 is a wasteful number, since it uses less digits than its factorization.

13791609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117896 (or 117893 counting only the distinct ones).

The product of its (nonzero) digits is 10206, while the sum is 36.

The square root of 13791609 is about 3713.7055618344. The cubic root of 13791609 is about 239.8124054895.

It can be divided in two parts, 13791 and 609, that added together give a square (14400 = 120²).

The spelling of 13791609 in words is "thirteen million, seven hundred ninety-one thousand, six hundred nine".