20131123113 has 6 divisors (see below), whose sum is σ = 29078288954. Its totient is φ = 13420748736.

The previous prime is 20131123109. The next prime is 20131123147. The reversal of 20131123113 is 31132113102.

It can be written as a sum of positive squares in only one way, i.e., 19713002409 + 418120704 = 140403^2 + 20448^2 .

It is not a de Polignac number, because 20131123113 - 2² = 20131123109 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20131123153) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1118395720 + ... + 1118395737.

Almost surely, 2^20131123113 is an apocalyptic number.

It is an amenable number.

20131123113 is a deficient number, since it is larger than the sum of its proper divisors (8947165841).

20131123113 is a wasteful number, since it uses less digits than its factorization.

20131123113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2236791463 (or 2236791460 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 20131123113 its reverse (31132113102), we get a palindrome (51263236215).

The spelling of 20131123113 in words is "twenty billion, one hundred thirty-one million, one hundred twenty-three thousand, one hundred thirteen".