13111331 has 4 divisors (see below), whose sum is σ = 13137600. Its totient is φ = 13085064.

The previous prime is 13111327. The next prime is 13111333. The reversal of 13111331 is 13311131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13311131 = 2411 ⋅5521.

It is a cyclic number.

It is not a de Polignac number, because 13111331 - 2² = 13111327 is a prime.

It is a super-2 number, since 2×13111331² = 343814001183122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13111333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12371 + ... + 13388.

It is an arithmetic number, because the mean of its divisors is an integer number (3284400).

Almost surely, 2^13111331 is an apocalyptic number.

13111331 is a deficient number, since it is larger than the sum of its proper divisors (26269).

13111331 is an equidigital number, since it uses as much as digits as its factorization.

13111331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26268.

The product of its digits is 27, while the sum is 14.

The square root of 13111331 is about 3620.9571938922. The cubic root of 13111331 is about 235.8027833862.

Adding to 13111331 its reverse (13311131), we get a palindrome (26422462).

The spelling of 13111331 in words is "thirteen million, one hundred eleven thousand, three hundred thirty-one".