136001243 has 4 divisors (see below), whose sum is σ = 155430000. Its totient is φ = 116572488.

The previous prime is 136001191. The next prime is 136001249. The reversal of 136001243 is 342100631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 342100631 = 37 ⋅9245963.

It is a cyclic number.

It is not a de Polignac number, because 136001243 - 2⁶ = 136001179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136001249) 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, 9714368 + ... + 9714381.

It is an arithmetic number, because the mean of its divisors is an integer number (38857500).

Almost surely, 2^136001243 is an apocalyptic number.

136001243 is a deficient number, since it is larger than the sum of its proper divisors (19428757).

136001243 is an equidigital number, since it uses as much as digits as its factorization.

136001243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19428756.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 136001243 is about 11661.9570827542. The cubic root of 136001243 is about 514.2578848440.

Adding to 136001243 its reverse (342100631), we get a palindrome (478101874).

The spelling of 136001243 in words is "one hundred thirty-six million, one thousand, two hundred forty-three".