13111120231 has 16 divisors (see below), whose sum is σ = 14579066880. Its totient is φ = 11689369120.

The previous prime is 13111120229. The next prime is 13111120241. The reversal of 13111120231 is 13202111131.

It is a happy number.

It is not a de Polignac number, because 13111120231 - 2¹ = 13111120229 is a prime.

It is a super-2 number, since 2×13111120231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13111120241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2599410 + ... + 2604448.

It is an arithmetic number, because the mean of its divisors is an integer number (911191680).

Almost surely, 2^13111120231 is an apocalyptic number.

13111120231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

13111120231 is a deficient number, since it is larger than the sum of its proper divisors (1467946649).

13111120231 is a wasteful number, since it uses less digits than its factorization.

13111120231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9566.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 13111120231 its reverse (13202111131), we get a palindrome (26313231362).

The spelling of 13111120231 in words is "thirteen billion, one hundred eleven million, one hundred twenty thousand, two hundred thirty-one".