13665361 has 4 divisors (see below), whose sum is σ = 13923252. Its totient is φ = 13407472.

The previous prime is 13665359. The next prime is 13665367. The reversal of 13665361 is 16356631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16356631 = 173 ⋅94547.

It can be written as a sum of positive squares in 2 ways, for example, as 10923025 + 2742336 = 3305^2 + 1656^2 .

It is a cyclic number.

It is not a de Polignac number, because 13665361 - 2¹ = 13665359 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13665367) 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, 128866 + ... + 128971.

It is an arithmetic number, because the mean of its divisors is an integer number (3480813).

Almost surely, 2^13665361 is an apocalyptic number.

It is an amenable number.

13665361 is a deficient number, since it is larger than the sum of its proper divisors (257891).

13665361 is an equidigital number, since it uses as much as digits as its factorization.

13665361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257890.

The product of its digits is 9720, while the sum is 31.

The square root of 13665361 is about 3696.6689059206. The cubic root of 13665361 is about 239.0784159395.

The spelling of 13665361 in words is "thirteen million, six hundred sixty-five thousand, three hundred sixty-one".