13111247 has 4 divisors (see below), whose sum is σ = 13119120. Its totient is φ = 13103376.

The previous prime is 13111237. The next prime is 13111271. The reversal of 13111247 is 74211131.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 13111247 - 2⁸ = 13110991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13111207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 347 + ... + 5132.

It is an arithmetic number, because the mean of its divisors is an integer number (3279780).

Almost surely, 2^13111247 is an apocalyptic number.

13111247 is a deficient number, since it is larger than the sum of its proper divisors (7873).

13111247 is an equidigital number, since it uses as much as digits as its factorization.

13111247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7872.

The product of its digits is 168, while the sum is 20.

The square root of 13111247 is about 3620.9455947307. The cubic root of 13111247 is about 235.8022798148.

Adding to 13111247 its reverse (74211131), we get a palindrome (87322378).

It can be divided in two parts, 1311124 and 7, that added together give a palindrome (1311131).

The spelling of 13111247 in words is "thirteen million, one hundred eleven thousand, two hundred forty-seven".