8518212049 has 4 divisors (see below), whose sum is σ = 9019283364. Its totient is φ = 8017140736.

The previous prime is 8518212019. The next prime is 8518212061. The reversal of 8518212049 is 9402128158.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9402128158 = 2 ⋅4701064079.

It can be written as a sum of positive squares in 2 ways, for example, as 4286059024 + 4232153025 = 65468^2 + 65055^2 .

It is a cyclic number.

It is not a de Polignac number, because 8518212049 - 2⁷ = 8518211921 is a prime.

It is a super-4 number, since 4×8518212049⁴ (a number of 41 digits) contains 4444 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8518212019) 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, 250535632 + ... + 250535665.

It is an arithmetic number, because the mean of its divisors is an integer number (2254820841).

Almost surely, 2^8518212049 is an apocalyptic number.

It is an amenable number.

8518212049 is a deficient number, since it is larger than the sum of its proper divisors (501071315).

8518212049 is a wasteful number, since it uses less digits than its factorization.

8518212049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501071314.

The product of its (nonzero) digits is 46080, while the sum is 40.

The square root of 8518212049 is about 92294.1604274073. The cubic root of 8518212049 is about 2042.2840661684.

The spelling of 8518212049 in words is "eight billion, five hundred eighteen million, two hundred twelve thousand, forty-nine".