136247249 has 4 divisors (see below), whose sum is σ = 140945460. Its totient is φ = 131549040.

The previous prime is 136247203. The next prime is 136247281. The reversal of 136247249 is 942742631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 942742631 = 277 ⋅3403403.

It can be written as a sum of positive squares in 2 ways, for example, as 55606849 + 80640400 = 7457^2 + 8980^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-136247249 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (136247549) 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, 2349062 + ... + 2349119.

It is an arithmetic number, because the mean of its divisors is an integer number (35236365).

Almost surely, 2^136247249 is an apocalyptic number.

It is an amenable number.

136247249 is a deficient number, since it is larger than the sum of its proper divisors (4698211).

136247249 is an equidigital number, since it uses as much as digits as its factorization.

136247249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4698210.

The product of its digits is 72576, while the sum is 38.

The square root of 136247249 is about 11672.4996894410. The cubic root of 136247249 is about 514.5677700564.

The spelling of 136247249 in words is "one hundred thirty-six million, two hundred forty-seven thousand, two hundred forty-nine".