8509136243 has 2 divisors, whose sum is σ = 8509136244. Its totient is φ = 8509136242.

The previous prime is 8509136221. The next prime is 8509136249. The reversal of 8509136243 is 3426319058.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8509136243 - 2¹² = 8509132147 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8509136243.

It is not a weakly prime, because it can be changed into another prime (8509136249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4254568121 + 4254568122.

It is an arithmetic number, because the mean of its divisors is an integer number (4254568122).

Almost surely, 2^8509136243 is an apocalyptic number.

8509136243 is a deficient number, since it is larger than the sum of its proper divisors (1).

8509136243 is an equidigital number, since it uses as much as digits as its factorization.

8509136243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 155520, while the sum is 41.

The square root of 8509136243 is about 92244.9795002416. The cubic root of 8509136243 is about 2041.5584850775.

The spelling of 8509136243 in words is "eight billion, five hundred nine million, one hundred thirty-six thousand, two hundred forty-three".