8220929 has 2 divisors, whose sum is σ = 8220930. Its totient is φ = 8220928.

The previous prime is 8220923. The next prime is 8220931. The reversal of 8220929 is 9290228.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8133904 + 87025 = 2852^2 + 295^2 .

It is a cyclic number.

It is not a de Polignac number, because 8220929 - 2¹² = 8216833 is a prime.

Together with 8220931, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 8220895 and 8220904.

It is not a weakly prime, because it can be changed into another prime (8220923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4110464 + 4110465.

It is an arithmetic number, because the mean of its divisors is an integer number (4110465).

Almost surely, 2^8220929 is an apocalyptic number.

It is an amenable number.

8220929 is a deficient number, since it is larger than the sum of its proper divisors (1).

8220929 is an equidigital number, since it uses as much as digits as its factorization.

8220929 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 8220929 is about 2867.2162457687. The cubic root of 8220929 is about 201.8243825399.

The spelling of 8220929 in words is "eight million, two hundred twenty thousand, nine hundred twenty-nine".