8115250009 has 4 divisors (see below), whose sum is σ = 8115506100. Its totient is φ = 8114993920.

The previous prime is 8115250001. The next prime is 8115250027. The reversal of 8115250009 is 9000525118.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2211632784 + 5903617225 = 47028^2 + 76835^2 .

It is a cyclic number.

It is not a de Polignac number, because 8115250009 - 2³ = 8115250001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8115250001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72472 + ... + 146569.

It is an arithmetic number, because the mean of its divisors is an integer number (2028876525).

Almost surely, 2^8115250009 is an apocalyptic number.

It is an amenable number.

8115250009 is a deficient number, since it is larger than the sum of its proper divisors (256091).

8115250009 is a wasteful number, since it uses less digits than its factorization.

8115250009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256090.

The product of its (nonzero) digits is 3600, while the sum is 31.

The square root of 8115250009 is about 90084.6824326977. The cubic root of 8115250009 is about 2009.5584130130.

The spelling of 8115250009 in words is "eight billion, one hundred fifteen million, two hundred fifty thousand, nine".