13091605 has 8 divisors (see below), whose sum is σ = 15872472. Its totient is φ = 10364928.

The previous prime is 13091597. The next prime is 13091621. The reversal of 13091605 is 50619031.

13091605 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1681 + 13089924 = 41^2 + 3618^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13091605 - 2³ = 13091597 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13091605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13012 + ... + 13981.

It is an arithmetic number, because the mean of its divisors is an integer number (1984059).

Almost surely, 2^13091605 is an apocalyptic number.

It is an amenable number.

13091605 is a deficient number, since it is larger than the sum of its proper divisors (2780867).

13091605 is an equidigital number, since it uses as much as digits as its factorization.

13091605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27095.

The product of its (nonzero) digits is 810, while the sum is 25.

The square root of 13091605 is about 3618.2323032111. The cubic root of 13091605 is about 235.6844689208.

The spelling of 13091605 in words is "thirteen million, ninety-one thousand, six hundred five".