191138616 has 80 divisors (see below), whose sum is σ = 566889840. Its totient is φ = 59961600.

The previous prime is 191138609. The next prime is 191138621. The reversal of 191138616 is 616831191.

It is a happy number.

191138616 is a `hidden beast` number, since 1 + 9 + 1 + 1 + 38 + 616 = 666.

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

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

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 19 ways as a sum of consecutive naturals, for example, 2341 + ... + 19691.

It is an arithmetic number, because the mean of its divisors is an integer number (7086123).

Almost surely, 2^191138616 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 191138616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (283444920).

191138616 is an abundant number, since it is smaller than the sum of its proper divisors (375751224).

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

191138616 is a wasteful number, since it uses less digits than its factorization.

191138616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17386 (or 17373 counting only the distinct ones).

The product of its digits is 7776, while the sum is 36.

The square root of 191138616 is about 13825.2890024043. The cubic root of 191138616 is about 576.0358050659.

The spelling of 191138616 in words is "one hundred ninety-one million, one hundred thirty-eight thousand, six hundred sixteen".