13561243 has 4 divisors (see below), whose sum is σ = 13681368. Its totient is φ = 13441120.

The previous prime is 13561199. The next prime is 13561259. The reversal of 13561243 is 34216531.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13561243 - 2¹³ = 13553051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13561843) 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, 59893 + ... + 60118.

It is an arithmetic number, because the mean of its divisors is an integer number (3420342).

Almost surely, 2^13561243 is an apocalyptic number.

13561243 is a deficient number, since it is larger than the sum of its proper divisors (120125).

13561243 is a wasteful number, since it uses less digits than its factorization.

13561243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120124.

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

The square root of 13561243 is about 3682.5593002693. The cubic root of 13561243 is about 238.4696783982.

Adding to 13561243 its reverse (34216531), we get a palindrome (47777774).

The spelling of 13561243 in words is "thirteen million, five hundred sixty-one thousand, two hundred forty-three".