135697591 has 8 divisors (see below), whose sum is σ = 136609200. Its totient is φ = 134789568.

The previous prime is 135697547. The next prime is 135697603. The reversal of 135697591 is 195796531.

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 135697591 - 2¹³ = 135689399 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 (135697511) 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, 128835 + ... + 129883.

It is an arithmetic number, because the mean of its divisors is an integer number (17076150).

Almost surely, 2^135697591 is an apocalyptic number.

135697591 is a deficient number, since it is larger than the sum of its proper divisors (911609).

135697591 is a wasteful number, since it uses less digits than its factorization.

135697591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1793.

The product of its digits is 255150, while the sum is 46.

The square root of 135697591 is about 11648.9308951509. The cubic root of 135697591 is about 513.8748692357.

The spelling of 135697591 in words is "one hundred thirty-five million, six hundred ninety-seven thousand, five hundred ninety-one".