999999901111 has 4 divisors (see below), whose sum is σ = 1008849457872. Its totient is φ = 991150344352.

The previous prime is 999999901097. The next prime is 999999901181. The reversal of 999999901111 is 111109999999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 111109999999 = 1607 ⋅69141257.

It is a cyclic number.

It is not a de Polignac number, because 999999901111 - 2²⁵ = 999966346679 is a prime.

It is a Smith number, since the sum of its digits (67) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999999901181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4424778211 + ... + 4424778436.

It is an arithmetic number, because the mean of its divisors is an integer number (252212364468).

Almost surely, 2^999999901111 is an apocalyptic number.

999999901111 is a deficient number, since it is larger than the sum of its proper divisors (8849556761).

999999901111 is a wasteful number, since it uses less digits than its factorization.

999999901111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8849556760.

The product of its (nonzero) digits is 4782969, while the sum is 67.

The spelling of 999999901111 in words is "nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred one thousand, one hundred eleven".