13615243 has 4 divisors (see below), whose sum is σ = 13623048. Its totient is φ = 13607440.

The previous prime is 13615213. The next prime is 13615291. The reversal of 13615243 is 34251631.

13615243 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: 34251631 = 1097 ⋅31223.

It is a cyclic number.

It is not a de Polignac number, because 13615243 - 2¹³ = 13607051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13615213) 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, 48 + ... + 5218.

It is an arithmetic number, because the mean of its divisors is an integer number (3405762).

Almost surely, 2^13615243 is an apocalyptic number.

13615243 is a deficient number, since it is larger than the sum of its proper divisors (7805).

13615243 is an equidigital number, since it uses as much as digits as its factorization.

13615243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7804.

The product of its digits is 2160, while the sum is 25.

The square root of 13615243 is about 3689.8838735115. The cubic root of 13615243 is about 238.7857828553.

Adding to 13615243 its reverse (34251631), we get a palindrome (47866874).

The spelling of 13615243 in words is "thirteen million, six hundred fifteen thousand, two hundred forty-three".