31123110313031 has 24 divisors (see below), whose sum is σ = 34239666300000. Its totient is φ = 28268959118400.

The previous prime is 31123110312991. The next prime is 31123110313033. The reversal of 31123110313031 is 13031301132113.

It is a de Polignac number, because none of the positive numbers 2^k-31123110313031 is a prime.

It is a super-2 number, since 2×31123110313031² (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 = 31123110312988 and 31123110313006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31123110313033) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1499970845 + ... + 1499991593.

It is an arithmetic number, because the mean of its divisors is an integer number (1426652762500).

Almost surely, 2^{31123110313031} is an apocalyptic number.

31123110313031 is a deficient number, since it is larger than the sum of its proper divisors (3116555986969).

31123110313031 is a wasteful number, since it uses less digits than its factorization.

31123110313031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31031 (or 31020 counting only the distinct ones).

The product of its (nonzero) digits is 486, while the sum is 23.

Adding to 31123110313031 its reverse (13031301132113), we get a palindrome (44154411445144).

The spelling of 31123110313031 in words is "thirty-one trillion, one hundred twenty-three billion, one hundred ten million, three hundred thirteen thousand, thirty-one".