136391 has 8 divisors (see below), whose sum is σ = 147744. Its totient is φ = 125440.

The previous prime is 136379. The next prime is 136393. The reversal of 136391 is 193631.

136391 = T₂₃ + T₂₄ + ... + T₉₃.

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 136391 - 2⁶ = 136327 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 136391.

It is not an unprimeable number, because it can be changed into a prime (136393) 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, 1151 + ... + 1263.

It is an arithmetic number, because the mean of its divisors is an integer number (18468).

2¹³⁶³⁹¹ is an apocalyptic number.

136391 is a deficient number, since it is larger than the sum of its proper divisors (11353).

136391 is a wasteful number, since it uses less digits than its factorization.

136391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201.

The product of its digits is 486, while the sum is 23.

The square root of 136391 is about 369.3115216183. The cubic root of 136391 is about 51.4748675562.

The spelling of 136391 in words is "one hundred thirty-six thousand, three hundred ninety-one".