13111111031 has 4 divisors (see below), whose sum is σ = 13117037832. Its totient is φ = 13105184232.

The previous prime is 13111111007. The next prime is 13111111051. The reversal of 13111111031 is 13011111131.

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 13111111031 - 2¹⁰ = 13111110007 is a prime.

It is a super-2 number, since 2×13111111031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13111110997 and 13111111015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13111111051) 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, 2960081 + ... + 2964506.

It is an arithmetic number, because the mean of its divisors is an integer number (3279259458).

Almost surely, 2^13111111031 is an apocalyptic number.

13111111031 is a deficient number, since it is larger than the sum of its proper divisors (5926801).

13111111031 is an equidigital number, since it uses as much as digits as its factorization.

13111111031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5926800.

The product of its (nonzero) digits is 9, while the sum is 14.

Adding to 13111111031 its reverse (13011111131), we get a palindrome (26122222162).

The spelling of 13111111031 in words is "thirteen billion, one hundred eleven million, one hundred eleven thousand, thirty-one".