100111101100991 has 2 divisors, whose sum is σ = 100111101100992. Its totient is φ = 100111101100990.

The previous prime is 100111101100987. The next prime is 100111101101027. The reversal of 100111101100991 is 199001101111001.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 100111101100991 - 2² = 100111101100987 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 100111101100991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100111101120991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50055550550495 + 50055550550496.

It is an arithmetic number, because the mean of its divisors is an integer number (50055550550496).

Almost surely, 2^{100111101100991} is an apocalyptic number.

100111101100991 is a deficient number, since it is larger than the sum of its proper divisors (1).

100111101100991 is an equidigital number, since it uses as much as digits as its factorization.

100111101100991 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 26.

Adding to 100111101100991 its reverse (199001101111001), we get a palindrome (299112202211992).

The spelling of 100111101100991 in words is "one hundred trillion, one hundred eleven billion, one hundred one million, one hundred thousand, nine hundred ninety-one".