31310320123 has 2 divisors, whose sum is σ = 31310320124. Its totient is φ = 31310320122.

The previous prime is 31310320117. The next prime is 31310320147. The reversal of 31310320123 is 32102301313.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31310320123 - 2²⁵ = 31276765691 is a prime.

It is a super-2 number, since 2×31310320123² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31310320123.

It is not a weakly prime, because it can be changed into another prime (31310320103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15655160061 + 15655160062.

It is an arithmetic number, because the mean of its divisors is an integer number (15655160062).

Almost surely, 2^31310320123 is an apocalyptic number.

31310320123 is a deficient number, since it is larger than the sum of its proper divisors (1).

31310320123 is an equidigital number, since it uses as much as digits as its factorization.

31310320123 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 19.

Adding to 31310320123 its reverse (32102301313), we get a palindrome (63412621436).

The spelling of 31310320123 in words is "thirty-one billion, three hundred ten million, three hundred twenty thousand, one hundred twenty-three".