136381 has 4 divisors (see below), whose sum is σ = 155872. Its totient is φ = 116892.

The previous prime is 136379. The next prime is 136393. The reversal of 136381 is 183631.

136381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 136381 - 2¹ = 136379 is a prime.

It is a super-2 number, since 2×136381² = 37199554322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9735 + ... + 9748.

It is an arithmetic number, because the mean of its divisors is an integer number (38968).

2¹³⁶³⁸¹ is an apocalyptic number.

It is an amenable number.

136381 is a deficient number, since it is larger than the sum of its proper divisors (19491).

136381 is an equidigital number, since it uses as much as digits as its factorization.

136381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19490.

The product of its digits is 432, while the sum is 22.

The square root of 136381 is about 369.2979826644. The cubic root of 136381 is about 51.4736095033.

It can be divided in two parts, 1363 and 81, that added together give a square (1444 = 38²).

The spelling of 136381 in words is "one hundred thirty-six thousand, three hundred eighty-one".