100100110110991 has 2 divisors, whose sum is σ = 100100110110992. Its totient is φ = 100100110110990.

The previous prime is 100100110110989. The next prime is 100100110111117. The reversal of 100100110110991 is 199011011001001.

It is a weak prime.

It is an emirp because it is prime and its reverse (199011011001001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 100100110110991 - 2¹ = 100100110110989 is a prime.

Together with 100100110110989, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100100110110191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50050055055495 + 50050055055496.

It is an arithmetic number, because the mean of its divisors is an integer number (50050055055496).

Almost surely, 2^{100100110110991} is an apocalyptic number.

100100110110991 is a deficient number, since it is larger than the sum of its proper divisors (1).

100100110110991 is an equidigital number, since it uses as much as digits as its factorization.

100100110110991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81, while the sum is 25.

Adding to 100100110110991 its reverse (199011011001001), we get a palindrome (299111121111992).

The spelling of 100100110110991 in words is "one hundred trillion, one hundred billion, one hundred ten million, one hundred ten thousand, nine hundred ninety-one".