135518191 has 8 divisors (see below), whose sum is σ = 138367440. Its totient is φ = 132679872.

The previous prime is 135518183. The next prime is 135518209. The reversal of 135518191 is 191815531.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 135518191 - 2³ = 135518183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135518111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25275 + ... + 30163.

It is an arithmetic number, because the mean of its divisors is an integer number (17295930).

Almost surely, 2^135518191 is an apocalyptic number.

135518191 is a deficient number, since it is larger than the sum of its proper divisors (2849249).

135518191 is an equidigital number, since it uses as much as digits as its factorization.

135518191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5465.

The product of its digits is 5400, while the sum is 34.

The square root of 135518191 is about 11641.2280709554. The cubic root of 135518191 is about 513.6483120134.

The spelling of 135518191 in words is "one hundred thirty-five million, five hundred eighteen thousand, one hundred ninety-one".