12117925691 has 2 divisors, whose sum is σ = 12117925692. Its totient is φ = 12117925690.

The previous prime is 12117925681. The next prime is 12117925717. The reversal of 12117925691 is 19652971121.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12117925691 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (12117925681) 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 as a sum of consecutive naturals, namely, 6058962845 + 6058962846.

It is an arithmetic number, because the mean of its divisors is an integer number (6058962846).

Almost surely, 2^12117925691 is an apocalyptic number.

12117925691 is a deficient number, since it is larger than the sum of its proper divisors (1).

12117925691 is an equidigital number, since it uses as much as digits as its factorization.

12117925691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68040, while the sum is 44.

The spelling of 12117925691 in words is "twelve billion, one hundred seventeen million, nine hundred twenty-five thousand, six hundred ninety-one".