136538243 has 4 divisors (see below), whose sum is σ = 139443360. Its totient is φ = 133633128.

The previous prime is 136538231. The next prime is 136538249. The reversal of 136538243 is 342835631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 342835631 = 23 ⋅14905897.

It is a cyclic number.

It is not a de Polignac number, because 136538243 - 2⁸ = 136537987 is a prime.

It is not an unprimeable number, because it can be changed into a prime (136538249) 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, 1452488 + ... + 1452581.

It is an arithmetic number, because the mean of its divisors is an integer number (34860840).

Almost surely, 2^136538243 is an apocalyptic number.

136538243 is a deficient number, since it is larger than the sum of its proper divisors (2905117).

136538243 is an equidigital number, since it uses as much as digits as its factorization.

136538243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2905116.

The product of its digits is 51840, while the sum is 35.

The square root of 136538243 is about 11684.9579802411. The cubic root of 136538243 is about 514.9338438915.

The spelling of 136538243 in words is "one hundred thirty-six million, five hundred thirty-eight thousand, two hundred forty-three".