31321031123 has 2 divisors, whose sum is σ = 31321031124. Its totient is φ = 31321031122.

The previous prime is 31321031117. The next prime is 31321031167. The reversal of 31321031123 is 32113012313.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31321031123 - 2⁴ = 31321031107 is a prime.

It is a super-2 number, since 2×31321031123² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31321031095 and 31321031104.

It is not a weakly prime, because it can be changed into another prime (31321033123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15660515561 + 15660515562.

It is an arithmetic number, because the mean of its divisors is an integer number (15660515562).

Almost surely, 2^31321031123 is an apocalyptic number.

31321031123 is a deficient number, since it is larger than the sum of its proper divisors (1).

31321031123 is an equidigital number, since it uses as much as digits as its factorization.

31321031123 is an evil number, because the sum of its binary digits is even.

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

Adding to 31321031123 its reverse (32113012313), we get a palindrome (63434043436).

The spelling of 31321031123 in words is "thirty-one billion, three hundred twenty-one million, thirty-one thousand, one hundred twenty-three".