8220557 has 2 divisors, whose sum is σ = 8220558. Its totient is φ = 8220556.

The previous prime is 8220551. The next prime is 8220577. The reversal of 8220557 is 7550228.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7873636 + 346921 = 2806^2 + 589^2 .

It is a cyclic number.

It is not a de Polignac number, because 8220557 - 2⁶ = 8220493 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 (8220551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4110278 + 4110279.

It is an arithmetic number, because the mean of its divisors is an integer number (4110279).

Almost surely, 2^8220557 is an apocalyptic number.

It is an amenable number.

8220557 is a deficient number, since it is larger than the sum of its proper divisors (1).

8220557 is an equidigital number, since it uses as much as digits as its factorization.

8220557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5600, while the sum is 29.

The square root of 8220557 is about 2867.1513737506. The cubic root of 8220557 is about 201.8213382853.

The spelling of 8220557 in words is "eight million, two hundred twenty thousand, five hundred fifty-seven".