8700531821 has 2 divisors, whose sum is σ = 8700531822. Its totient is φ = 8700531820.

The previous prime is 8700531797. The next prime is 8700531869. The reversal of 8700531821 is 1281350078.

8700531821 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7104129796 + 1596402025 = 84286^2 + 39955^2 .

It is a cyclic number.

It is not a de Polignac number, because 8700531821 - 2¹⁴ = 8700515437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8700531421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4350265910 + 4350265911.

It is an arithmetic number, because the mean of its divisors is an integer number (4350265911).

Almost surely, 2^8700531821 is an apocalyptic number.

It is an amenable number.

8700531821 is a deficient number, since it is larger than the sum of its proper divisors (1).

8700531821 is an equidigital number, since it uses as much as digits as its factorization.

8700531821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13440, while the sum is 35.

The square root of 8700531821 is about 93276.6413471240. The cubic root of 8700531821 is about 2056.7520234605.

Adding to 8700531821 its reverse (1281350078), we get a palindrome (9981881899).

The spelling of 8700531821 in words is "eight billion, seven hundred million, five hundred thirty-one thousand, eight hundred twenty-one".