8319821 has 2 divisors, whose sum is σ = 8319822. Its totient is φ = 8319820.

The previous prime is 8319803. The next prime is 8319833. The reversal of 8319821 is 1289138.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7022500 + 1297321 = 2650^2 + 1139^2 .

It is a cyclic number.

It is not a de Polignac number, because 8319821 - 2⁶ = 8319757 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8319841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4159910 + 4159911.

It is an arithmetic number, because the mean of its divisors is an integer number (4159911).

Almost surely, 2^8319821 is an apocalyptic number.

It is an amenable number.

8319821 is a deficient number, since it is larger than the sum of its proper divisors (1).

8319821 is an equidigital number, since it uses as much as digits as its factorization.

8319821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 32.

The square root of 8319821 is about 2884.4099916621. The cubic root of 8319821 is about 202.6304275843.

The spelling of 8319821 in words is "eight million, three hundred nineteen thousand, eight hundred twenty-one".