100001100010991 has 2 divisors, whose sum is σ = 100001100010992. Its totient is φ = 100001100010990.

The previous prime is 100001100010963. The next prime is 100001100011023. The reversal of 100001100010991 is 199010001100001.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100001100010991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100001100010291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50000550005495 + 50000550005496.

It is an arithmetic number, because the mean of its divisors is an integer number (50000550005496).

Almost surely, 2^{100001100010991} is an apocalyptic number.

100001100010991 is a deficient number, since it is larger than the sum of its proper divisors (1).

100001100010991 is an equidigital number, since it uses as much as digits as its factorization.

100001100010991 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 23.

Adding to 100001100010991 its reverse (199010001100001), we get a palindrome (299011101110992).

The spelling of 100001100010991 in words is "one hundred trillion, one billion, one hundred million, ten thousand, nine hundred ninety-one".