191901066 has 64 divisors (see below), whose sum is σ = 466290432. Its totient is φ = 51397632.

The previous prime is 191901053. The next prime is 191901071. The reversal of 191901066 is 660109191.

191901066 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 283120 + ... + 283796.

It is an arithmetic number, because the mean of its divisors is an integer number (7285788).

Almost surely, 2^191901066 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 191901066, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (233145216).

191901066 is an abundant number, since it is smaller than the sum of its proper divisors (274389366).

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

191901066 is a wasteful number, since it uses less digits than its factorization.

191901066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1103.

The product of its (nonzero) digits is 2916, while the sum is 33.

The square root of 191901066 is about 13852.8360273267. The cubic root of 191901066 is about 576.8007225437.

The spelling of 191901066 in words is "one hundred ninety-one million, nine hundred one thousand, sixty-six".