8220851 has 2 divisors, whose sum is σ = 8220852. Its totient is φ = 8220850.

The previous prime is 8220803. The next prime is 8220853. The reversal of 8220851 is 1580228.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8220851 is a prime.

Together with 8220853, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8220851.

It is not a weakly prime, because it can be changed into another prime (8220853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4110425 + 4110426.

It is an arithmetic number, because the mean of its divisors is an integer number (4110426).

Almost surely, 2^8220851 is an apocalyptic number.

8220851 is a deficient number, since it is larger than the sum of its proper divisors (1).

8220851 is an equidigital number, since it uses as much as digits as its factorization.

8220851 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1280, while the sum is 26.

The square root of 8220851 is about 2867.2026436930. The cubic root of 8220851 is about 201.8237442360.

The spelling of 8220851 in words is "eight million, two hundred twenty thousand, eight hundred fifty-one".