10111100109991 has 2 divisors, whose sum is σ = 10111100109992. Its totient is φ = 10111100109990.

The previous prime is 10111100109967. The next prime is 10111100110021. The reversal of 10111100109991 is 19990100111101.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 10111100109991 - 2⁵ = 10111100109959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10111100109091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5055550054995 + 5055550054996.

It is an arithmetic number, because the mean of its divisors is an integer number (5055550054996).

Almost surely, 2^{10111100109991} is an apocalyptic number.

10111100109991 is a deficient number, since it is larger than the sum of its proper divisors (1).

10111100109991 is an equidigital number, since it uses as much as digits as its factorization.

10111100109991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 729, while the sum is 34.

The spelling of 10111100109991 in words is "ten trillion, one hundred eleven billion, one hundred million, one hundred nine thousand, nine hundred ninety-one".