31123310123 has 2 divisors, whose sum is σ = 31123310124. Its totient is φ = 31123310122.

The previous prime is 31123310093. The next prime is 31123310159. The reversal of 31123310123 is 32101332113.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31123310123 - 2²⁴ = 31106532907 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31123310095 and 31123310104.

It is not a weakly prime, because it can be changed into another prime (31123310923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15561655061 + 15561655062.

It is an arithmetic number, because the mean of its divisors is an integer number (15561655062).

Almost surely, 2^31123310123 is an apocalyptic number.

31123310123 is a deficient number, since it is larger than the sum of its proper divisors (1).

31123310123 is an equidigital number, since it uses as much as digits as its factorization.

31123310123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 31123310123 its reverse (32101332113), we get a palindrome (63224642236).

The spelling of 31123310123 in words is "thirty-one billion, one hundred twenty-three million, three hundred ten thousand, one hundred twenty-three".