8521505345 has 8 divisors (see below), whose sum is σ = 10227055464. Its totient is φ = 6816371584.

The previous prime is 8521505303. The next prime is 8521505351. The reversal of 8521505345 is 5435051258.

It is a Cunningham number, because it is equal to 92312²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 722319376 + 7799185969 = 26876^2 + 88313^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8521505345 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8521505299 and 8521505308.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57134 + ... + 142503.

It is an arithmetic number, because the mean of its divisors is an integer number (1278381933).

Almost surely, 2^8521505345 is an apocalyptic number.

It is an amenable number.

8521505345 is a deficient number, since it is larger than the sum of its proper divisors (1705550119).

8521505345 is a wasteful number, since it uses less digits than its factorization.

8521505345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208179.

The product of its (nonzero) digits is 120000, while the sum is 38.

The square root of 8521505345 is about 92312.0000054164. Note that the first 5 decimals coincide. The cubic root of 8521505345 is about 2042.5472270021.

The spelling of 8521505345 in words is "eight billion, five hundred twenty-one million, five hundred five thousand, three hundred forty-five".