136181 has 4 divisors (see below), whose sum is σ = 139392. Its totient is φ = 132972.

The previous prime is 136177. The next prime is 136189. The reversal of 136181 is 181631.

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 136181 - 2² = 136177 is a prime.

It is a super-2 number, since 2×136181² = 37090529522, which contains 22 as substring.

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 136181.

It is not an unprimeable number, because it can be changed into a prime (136189) 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, 1541 + ... + 1626.

It is an arithmetic number, because the mean of its divisors is an integer number (34848).

2¹³⁶¹⁸¹ is an apocalyptic number.

It is an amenable number.

136181 is a deficient number, since it is larger than the sum of its proper divisors (3211).

136181 is an equidigital number, since it uses as much as digits as its factorization.

136181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3210.

The product of its digits is 144, while the sum is 20.

The square root of 136181 is about 369.0270992759. The cubic root of 136181 is about 51.4484355218.

Subtracting from 136181 its sum of digits (20), we obtain a square (136161 = 369²).

The spelling of 136181 in words is "one hundred thirty-six thousand, one hundred eighty-one".