12991200117 has 16 divisors (see below), whose sum is σ = 20200118400. Its totient is φ = 7423542336.

The previous prime is 12991200059. The next prime is 12991200121. The reversal of 12991200117 is 71100219921.

It is not a de Polignac number, because 12991200117 - 2³¹ = 10843716469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12991200137) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6311508 + ... + 6313565.

It is an arithmetic number, because the mean of its divisors is an integer number (1262507400).

Almost surely, 2^12991200117 is an apocalyptic number.

It is an amenable number.

12991200117 is a deficient number, since it is larger than the sum of its proper divisors (7208918283).

12991200117 is an equidigital number, since it uses as much as digits as its factorization.

12991200117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12625097 (or 12625083 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 33.

The spelling of 12991200117 in words is "twelve billion, nine hundred ninety-one million, two hundred thousand, one hundred seventeen".