100001011099991 has 2 divisors, whose sum is σ = 100001011099992. Its totient is φ = 100001011099990.

The previous prime is 100001011099981. The next prime is 100001011100009. The reversal of 100001011099991 is 199990110100001.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 100001011099991 - 2³⁸ = 99726133193047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100001011099981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50000505549995 + 50000505549996.

It is an arithmetic number, because the mean of its divisors is an integer number (50000505549996).

Almost surely, 2^{100001011099991} is an apocalyptic number.

100001011099991 is a deficient number, since it is larger than the sum of its proper divisors (1).

100001011099991 is an equidigital number, since it uses as much as digits as its factorization.

100001011099991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6561, while the sum is 41.

Adding to 100001011099991 its reverse (199990110100001), we get a palindrome (299991121199992).

The spelling of 100001011099991 in words is "one hundred trillion, one billion, eleven million, ninety-nine thousand, nine hundred ninety-one".