31313131111123 has 4 divisors (see below), whose sum is σ = 31453548739648. Its totient is φ = 31172713482600.

The previous prime is 31313131111111. The next prime is 31313131111169. The reversal of 31313131111123 is 32111113131313.

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 31313131111123 - 2⁵ = 31313131111091 is a prime.

It is a super-2 number, since 2×31313131111123² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31313131211123) 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, 70208813928 + ... + 70208814373.

It is an arithmetic number, because the mean of its divisors is an integer number (7863387184912).

Almost surely, 2^{31313131111123} is an apocalyptic number.

31313131111123 is a deficient number, since it is larger than the sum of its proper divisors (140417628525).

31313131111123 is a wasteful number, since it uses less digits than its factorization.

31313131111123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140417628524.

The product of its digits is 486, while the sum is 25.

Adding to 31313131111123 its reverse (32111113131313), we get a palindrome (63424244242436).

The spelling of 31313131111123 in words is "thirty-one trillion, three hundred thirteen billion, one hundred thirty-one million, one hundred eleven thousand, one hundred twenty-three".