136243 has 4 divisors (see below), whose sum is σ = 139608. Its totient is φ = 132880.

The previous prime is 136237. The next prime is 136247. The reversal of 136243 is 342631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 342631 = 23 ⋅14897.

It is a cyclic number.

It is not a de Polignac number, because 136243 - 2⁹ = 135731 is a prime.

It is a Duffinian number.

136243 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 136243.

It is not an unprimeable number, because it can be changed into a prime (136247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1621 + ... + 1702.

It is an arithmetic number, because the mean of its divisors is an integer number (34902).

2¹³⁶²⁴³ is an apocalyptic number.

136243 is a deficient number, since it is larger than the sum of its proper divisors (3365).

136243 is an equidigital number, since it uses as much as digits as its factorization.

136243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3364.

The product of its digits is 432, while the sum is 19.

The square root of 136243 is about 369.1110943876. Note that the first 3 decimals coincide. The cubic root of 136243 is about 51.4562420906.

Adding to 136243 its reverse (342631), we get a palindrome (478874).

The spelling of 136243 in words is "one hundred thirty-six thousand, two hundred forty-three".