13591261 has 4 divisors (see below), whose sum is σ = 13599900. Its totient is φ = 13582624.

The previous prime is 13591243. The next prime is 13591283. The reversal of 13591261 is 16219531.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 16219531 = 23 ⋅705197.

It can be written as a sum of positive squares in 2 ways, for example, as 7371225 + 6220036 = 2715^2 + 2494^2 .

It is a cyclic number.

It is not a de Polignac number, because 13591261 - 2⁷ = 13591133 is a prime.

It is a Duffinian number.

It is a plaindrome in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13591231) 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, 1216 + ... + 5353.

It is an arithmetic number, because the mean of its divisors is an integer number (3399975).

Almost surely, 2^13591261 is an apocalyptic number.

It is an amenable number.

13591261 is a deficient number, since it is larger than the sum of its proper divisors (8639).

13591261 is an equidigital number, since it uses as much as digits as its factorization.

13591261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8638.

The product of its digits is 1620, while the sum is 28.

The square root of 13591261 is about 3686.6327454738. The cubic root of 13591261 is about 238.6455007169.

The spelling of 13591261 in words is "thirteen million, five hundred ninety-one thousand, two hundred sixty-one".