8684724869 has 2 divisors, whose sum is σ = 8684724870. Its totient is φ = 8684724868.

The previous prime is 8684724863. The next prime is 8684724929. The reversal of 8684724869 is 9684274868.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6738768100 + 1945956769 = 82090^2 + 44113^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8684724869 is a prime.

It is a super-2 number, since 2×8684724869² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8684724863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4342362434 + 4342362435.

It is an arithmetic number, because the mean of its divisors is an integer number (4342362435).

Almost surely, 2^8684724869 is an apocalyptic number.

It is an amenable number.

8684724869 is a deficient number, since it is larger than the sum of its proper divisors (1).

8684724869 is an equidigital number, since it uses as much as digits as its factorization.

8684724869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37158912, while the sum is 62.

The square root of 8684724869 is about 93191.8712603197. The cubic root of 8684724869 is about 2055.5057131005.

The spelling of 8684724869 in words is "eight billion, six hundred eighty-four million, seven hundred twenty-four thousand, eight hundred sixty-nine".