191137086 has 144 divisors (see below), whose sum is σ = 522980640. Its totient is φ = 49351680.

The previous prime is 191137073. The next prime is 191137097. The reversal of 191137086 is 680731191.

191137086 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 191137086.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1055916 + ... + 1056096.

It is an arithmetic number, because the mean of its divisors is an integer number (3631810).

Almost surely, 2^191137086 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 191137086, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (261490320).

191137086 is an abundant number, since it is smaller than the sum of its proper divisors (331843554).

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

191137086 is a wasteful number, since it uses less digits than its factorization.

191137086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259 (or 239 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 191137086 is about 13825.2336689114. The cubic root of 191137086 is about 576.0342680712.

The spelling of 191137086 in words is "one hundred ninety-one million, one hundred thirty-seven thousand, eighty-six".