8935619821 has 2 divisors, whose sum is σ = 8935619822. Its totient is φ = 8935619820.

The previous prime is 8935619789. The next prime is 8935619863. The reversal of 8935619821 is 1289165398.

8935619821 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., 7445273796 + 1490346025 = 86286^2 + 38605^2 .

It is a cyclic number.

It is not a de Polignac number, because 8935619821 - 2⁵ = 8935619789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8935119821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4467809910 + 4467809911.

It is an arithmetic number, because the mean of its divisors is an integer number (4467809911).

Almost surely, 2^8935619821 is an apocalyptic number.

It is an amenable number.

8935619821 is a deficient number, since it is larger than the sum of its proper divisors (1).

8935619821 is an equidigital number, since it uses as much as digits as its factorization.

8935619821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 933120, while the sum is 52.

The square root of 8935619821 is about 94528.4074815608. The cubic root of 8935619821 is about 2075.1120911819.

The spelling of 8935619821 in words is "eight billion, nine hundred thirty-five million, six hundred nineteen thousand, eight hundred twenty-one".