191201111011 has 16 divisors (see below), whose sum is σ = 208713780000. Its totient is φ = 174463946496.

The previous prime is 191201110987. The next prime is 191201111039. The reversal of 191201111011 is 110111102191.

It is a cyclic number.

It is not a de Polignac number, because 191201111011 - 2³¹ = 189053627363 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 191201111011.

It is not an unprimeable number, because it can be changed into a prime (191201111041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 198856 + ... + 649573.

It is an arithmetic number, because the mean of its divisors is an integer number (13044611250).

Almost surely, 2^191201111011 is an apocalyptic number.

191201111011 is a deficient number, since it is larger than the sum of its proper divisors (17512668989).

191201111011 is a wasteful number, since it uses less digits than its factorization.

191201111011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 848886.

The product of its (nonzero) digits is 18, while the sum is 19.

The spelling of 191201111011 in words is "one hundred ninety-one billion, two hundred one million, one hundred eleven thousand, eleven".