191109291102 has 96 divisors (see below), whose sum is σ = 463609246464. Its totient is φ = 56606515200.

The previous prime is 191109291091. The next prime is 191109291103. The reversal of 191109291102 is 201192901191.

191109291102 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×191109291102² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191109291103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 143238 + ... + 634614.

It is an arithmetic number, because the mean of its divisors is an integer number (4829262984).

Almost surely, 2^191109291102 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 191109291102, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (231804623232).

191109291102 is an abundant number, since it is smaller than the sum of its proper divisors (272499955362).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

191109291102 is a wasteful number, since it uses less digits than its factorization.

191109291102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 491474 (or 491471 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 36.

The spelling of 191109291102 in words is "one hundred ninety-one billion, one hundred nine million, two hundred ninety-one thousand, one hundred two".