2001991109111 has 32 divisors (see below), whose sum is σ = 2376679587840. Its totient is φ = 1650912827616.

The previous prime is 2001991109089. The next prime is 2001991109159. The reversal of 2001991109111 is 1119011991002.

It is a cyclic number.

It is not a de Polignac number, because 2001991109111 - 2²⁶ = 2001924000247 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 (2001991109161) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5730296 + ... + 6069618.

It is an arithmetic number, because the mean of its divisors is an integer number (74271237120).

Almost surely, 2^{2001991109111} is an apocalyptic number.

2001991109111 is a deficient number, since it is larger than the sum of its proper divisors (374688478729).

2001991109111 is a wasteful number, since it uses less digits than its factorization.

2001991109111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339683.

The product of its (nonzero) digits is 1458, while the sum is 35.

The spelling of 2001991109111 in words is "two trillion, one billion, nine hundred ninety-one million, one hundred nine thousand, one hundred eleven".