191368818 has 48 divisors (see below), whose sum is σ = 431872896. Its totient is φ = 63510480.

The previous prime is 191368811. The next prime is 191368823. The reversal of 191368818 is 818863191.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (191368811) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 130980 + ... + 132432.

It is an arithmetic number, because the mean of its divisors is an integer number (8997352).

Almost surely, 2^191368818 is an apocalyptic number.

191368818 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 191368818, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (215936448).

191368818 is an abundant number, since it is smaller than the sum of its proper divisors (240504078).

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

191368818 is a wasteful number, since it uses less digits than its factorization.

191368818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1741 (or 1729 counting only the distinct ones).

The product of its digits is 82944, while the sum is 45.

The square root of 191368818 is about 13833.6118927777. The cubic root of 191368818 is about 576.2669660904.

The spelling of 191368818 in words is "one hundred ninety-one million, three hundred sixty-eight thousand, eight hundred eighteen".