10891199111 has 4 divisors (see below), whose sum is σ = 11728983672. Its totient is φ = 10053414552.

The previous prime is 10891199083. The next prime is 10891199129. The reversal of 10891199111 is 11199119801.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11199119801 = 17 ⋅658771753.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10891199111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10891199191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 418892261 + ... + 418892286.

It is an arithmetic number, because the mean of its divisors is an integer number (2932245918).

Almost surely, 2^10891199111 is an apocalyptic number.

10891199111 is a deficient number, since it is larger than the sum of its proper divisors (837784561).

10891199111 is an equidigital number, since it uses as much as digits as its factorization.

10891199111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 837784560.

The product of its (nonzero) digits is 5832, while the sum is 41.

The spelling of 10891199111 in words is "ten billion, eight hundred ninety-one million, one hundred ninety-nine thousand, one hundred eleven".