136831243 has 2 divisors, whose sum is σ = 136831244. Its totient is φ = 136831242.

The previous prime is 136831237. The next prime is 136831259. The reversal of 136831243 is 342138631.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-136831243 is a prime.

It is not a weakly prime, because it can be changed into another prime (136831223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68415621 + 68415622.

It is an arithmetic number, because the mean of its divisors is an integer number (68415622).

Almost surely, 2^136831243 is an apocalyptic number.

136831243 is a deficient number, since it is larger than the sum of its proper divisors (1).

136831243 is an equidigital number, since it uses as much as digits as its factorization.

136831243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 31.

The square root of 136831243 is about 11697.4887475902. The cubic root of 136831243 is about 515.3019161599.

Adding to 136831243 its reverse (342138631), we get a palindrome (478969874).

The spelling of 136831243 in words is "one hundred thirty-six million, eight hundred thirty-one thousand, two hundred forty-three".