13111111 has 4 divisors (see below), whose sum is σ = 14119672. Its totient is φ = 12102552.

The previous prime is 13111093. The next prime is 13111117. The reversal of 13111111 is 11111131.

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 13111111 - 2⁵ = 13111079 is a prime.

It is a Duffinian number.

13111111 is a modest number, since divided by 11111 gives 131 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13111117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 504261 + ... + 504286.

It is an arithmetic number, because the mean of its divisors is an integer number (3529918).

Almost surely, 2^13111111 is an apocalyptic number.

13111111 is a deficient number, since it is larger than the sum of its proper divisors (1008561).

13111111 is a wasteful number, since it uses less digits than its factorization.

13111111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1008560.

The product of its digits is 3, while the sum is 10.

The square root of 13111111 is about 3620.9268150572. The cubic root of 13111111 is about 235.8014645041.

Adding to 13111111 its reverse (11111131), we get a palindrome (24222242).

It can be divided in two parts, 131 and 11111, that multiplied together give a palindrome (1455541).

The spelling of 13111111 in words is "thirteen million, one hundred eleven thousand, one hundred eleven".