191981016 has 160 divisors (see below), whose sum is σ = 585446400. Its totient is φ = 58553280.

The previous prime is 191980967. The next prime is 191981033. The reversal of 191981016 is 610189191.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 381421 + ... + 381923.

It is an arithmetic number, because the mean of its divisors is an integer number (3659040).

Almost surely, 2^191981016 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 191981016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (292723200).

191981016 is an abundant number, since it is smaller than the sum of its proper divisors (393465384).

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

191981016 is a wasteful number, since it uses less digits than its factorization.

191981016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 571 (or 558 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 36.

The square root of 191981016 is about 13855.7214175228. The cubic root of 191981016 is about 576.8808138394.

The spelling of 191981016 in words is "one hundred ninety-one million, nine hundred eighty-one thousand, sixteen".