31311121111123 has 4 divisors (see below), whose sum is σ = 35784138412720. Its totient is φ = 26838103809528.

The previous prime is 31311121111117. The next prime is 31311121111159. The reversal of 31311121111123 is 32111112111313.

It is a happy number.

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 31311121111123 - 2²⁵ = 31311087556691 is a prime.

It is a super-2 number, since 2×31311121111123² (a number of 28 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 = 31311121111094 and 31311121111103.

It is not an unprimeable number, because it can be changed into a prime (31311121111103) 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, 2236508650788 + ... + 2236508650801.

It is an arithmetic number, because the mean of its divisors is an integer number (8946034603180).

Almost surely, 2^{31311121111123} is an apocalyptic number.

31311121111123 is a deficient number, since it is larger than the sum of its proper divisors (4473017301597).

31311121111123 is an equidigital number, since it uses as much as digits as its factorization.

31311121111123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4473017301596.

The product of its digits is 108, while the sum is 22.

Adding to 31311121111123 its reverse (32111112111313), we get a palindrome (63422233222436).

The spelling of 31311121111123 in words is "thirty-one trillion, three hundred eleven billion, one hundred twenty-one million, one hundred eleven thousand, one hundred twenty-three".