31000123113 has 16 divisors (see below), whose sum is σ = 43700632320. Its totient is φ = 19492765776.

The previous prime is 31000123103. The next prime is 31000123157. The reversal of 31000123113 is 31132100013.

It is not a de Polignac number, because 31000123113 - 2⁵ = 31000123081 is a prime.

It is a super-2 number, since 2×31000123113² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31000123092 and 31000123101.

It is not an unprimeable number, because it can be changed into a prime (31000123103) 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 15 ways as a sum of consecutive naturals, for example, 1184995 + ... + 1210872.

It is an arithmetic number, because the mean of its divisors is an integer number (2731289520).

Almost surely, 2^31000123113 is an apocalyptic number.

It is an amenable number.

31000123113 is a deficient number, since it is larger than the sum of its proper divisors (12700509207).

31000123113 is a wasteful number, since it uses less digits than its factorization.

31000123113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2396116.

The product of its (nonzero) digits is 54, while the sum is 15.

Adding to 31000123113 its reverse (31132100013), we get a palindrome (62132223126).

The spelling of 31000123113 in words is "thirty-one billion, one hundred twenty-three thousand, one hundred thirteen".