31131103331123 has 4 divisors (see below), whose sum is σ = 32962344703560. Its totient is φ = 29299861958688.

The previous prime is 31131103331071. The next prime is 31131103331131. The reversal of 31131103331123 is 32113330113113.

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 31131103331123 - 2⁸ = 31131103330867 is a prime.

It is a super-2 number, since 2×31131103331123² (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 = 31131103331092 and 31131103331101.

It is not an unprimeable number, because it can be changed into a prime (31131103331023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 915620686193 + ... + 915620686226.

It is an arithmetic number, because the mean of its divisors is an integer number (8240586175890).

Almost surely, 2^{31131103331123} is an apocalyptic number.

31131103331123 is a deficient number, since it is larger than the sum of its proper divisors (1831241372437).

31131103331123 is a wasteful number, since it uses less digits than its factorization.

31131103331123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1831241372436.

The product of its (nonzero) digits is 1458, while the sum is 26.

Adding to 31131103331123 its reverse (32113330113113), we get a palindrome (63244433444236).

The spelling of 31131103331123 in words is "thirty-one trillion, one hundred thirty-one billion, one hundred three million, three hundred thirty-one thousand, one hundred twenty-three".