191216 has 40 divisors (see below), whose sum is σ = 424080. Its totient is φ = 82944.

The previous prime is 191189. The next prime is 191227. The reversal of 191216 is 612191.

It is a congruent number.

It is an unprimeable number.

191216 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5150 + ... + 5186.

It is an arithmetic number, because the mean of its divisors is an integer number (10602).

2¹⁹¹²¹⁶ is an apocalyptic number.

191216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 191216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (212040).

191216 is an abundant number, since it is smaller than the sum of its proper divisors (232864).

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

191216 is a wasteful number, since it uses less digits than its factorization.

191216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81 (or 75 counting only the distinct ones).

The product of its digits is 108, while the sum is 20.

The square root of 191216 is about 437.2825173729. The cubic root of 191216 is about 57.6113532148.

It can be divided in two parts, 19 and 1216, that multiplied together give a square (23104 = 152²).

The spelling of 191216 in words is "one hundred ninety-one thousand, two hundred sixteen".