8509136249 has 2 divisors, whose sum is σ = 8509136250. Its totient is φ = 8509136248.

The previous prime is 8509136243. The next prime is 8509136287. The reversal of 8509136249 is 9426319058.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5892097600 + 2617038649 = 76760^2 + 51157^2 .

It is a cyclic number.

It is not a de Polignac number, because 8509136249 - 2²⁰ = 8508087673 is a prime.

It is not a weakly prime, because it can be changed into another prime (8509136243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4254568124 + 4254568125.

It is an arithmetic number, because the mean of its divisors is an integer number (4254568125).

Almost surely, 2^8509136249 is an apocalyptic number.

It is an amenable number.

8509136249 is a deficient number, since it is larger than the sum of its proper divisors (1).

8509136249 is an equidigital number, since it uses as much as digits as its factorization.

8509136249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 466560, while the sum is 47.

The square root of 8509136249 is about 92244.9795327637. The cubic root of 8509136249 is about 2041.5584855573.

The spelling of 8509136249 in words is "eight billion, five hundred nine million, one hundred thirty-six thousand, two hundred forty-nine".