13661243 has 4 divisors (see below), whose sum is σ = 13668768. Its totient is φ = 13653720.

The previous prime is 13661237. The next prime is 13661261. The reversal of 13661243 is 34216631.

13661243 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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 34216631 = 17 ⋅2012743.

It is a cyclic number.

It is not a de Polignac number, because 13661243 - 2¹⁴ = 13644859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13667243) 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, 830 + ... + 5292.

It is an arithmetic number, because the mean of its divisors is an integer number (3417192).

Almost surely, 2^13661243 is an apocalyptic number.

13661243 is a deficient number, since it is larger than the sum of its proper divisors (7525).

13661243 is an equidigital number, since it uses as much as digits as its factorization.

13661243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7524.

The product of its digits is 2592, while the sum is 26.

The square root of 13661243 is about 3696.1118760124. Note that the first 3 decimals coincide. The cubic root of 13661243 is about 239.0543984297.

Adding to 13661243 its reverse (34216631), we get a palindrome (47877874).

The spelling of 13661243 in words is "thirteen million, six hundred sixty-one thousand, two hundred forty-three".