136609591 has 8 divisors (see below), whose sum is σ = 142313600. Its totient is φ = 130986720.

The previous prime is 136609579. The next prime is 136609631. The reversal of 136609591 is 195906631.

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 136609591 - 2¹¹ = 136607543 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 (136609391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16836 + ... + 23593.

It is an arithmetic number, because the mean of its divisors is an integer number (17789200).

Almost surely, 2^136609591 is an apocalyptic number.

136609591 is a deficient number, since it is larger than the sum of its proper divisors (5704009).

136609591 is a wasteful number, since it uses less digits than its factorization.

136609591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40569.

The product of its (nonzero) digits is 43740, while the sum is 40.

The square root of 136609591 is about 11688.0105663881. The cubic root of 136609591 is about 515.0235210924.

The spelling of 136609591 in words is "one hundred thirty-six million, six hundred nine thousand, five hundred ninety-one".