135261191 has 8 divisors (see below), whose sum is σ = 150689280. Its totient is φ = 120550752.

The previous prime is 135261179. The next prime is 135261239. The reversal of 135261191 is 191162531.

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 135261191 - 2⁶ = 135261127 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135261391) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 179015 + ... + 179768.

It is an arithmetic number, because the mean of its divisors is an integer number (18836160).

Almost surely, 2^135261191 is an apocalyptic number.

135261191 is a deficient number, since it is larger than the sum of its proper divisors (15428089).

135261191 is a wasteful number, since it uses less digits than its factorization.

135261191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358825.

The product of its digits is 1620, while the sum is 29.

The square root of 135261191 is about 11630.1844783305. The cubic root of 135261191 is about 513.3234081494.

The spelling of 135261191 in words is "one hundred thirty-five million, two hundred sixty-one thousand, one hundred ninety-one".