8723603821 has 2 divisors, whose sum is σ = 8723603822. Its totient is φ = 8723603820.

The previous prime is 8723603797. The next prime is 8723603827. The reversal of 8723603821 is 1283063278.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5973125796 + 2750478025 = 77286^2 + 52445^2 .

It is a cyclic number.

It is not a de Polignac number, because 8723603821 - 2⁹ = 8723603309 is a prime.

It is a super-2 number, since 2×8723603821² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8723603827) 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 as a sum of consecutive naturals, namely, 4361801910 + 4361801911.

It is an arithmetic number, because the mean of its divisors is an integer number (4361801911).

Almost surely, 2^8723603821 is an apocalyptic number.

It is an amenable number.

8723603821 is a deficient number, since it is larger than the sum of its proper divisors (1).

8723603821 is an equidigital number, since it uses as much as digits as its factorization.

8723603821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 8723603821 is about 93400.2345874998. The cubic root of 8723603821 is about 2058.5684449486.

The spelling of 8723603821 in words is "eight billion, seven hundred twenty-three million, six hundred three thousand, eight hundred twenty-one".