8220551 has 2 divisors, whose sum is σ = 8220552. Its totient is φ = 8220550.

The previous prime is 8220523. The next prime is 8220557. The reversal of 8220551 is 1550228.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8220551 - 2¹⁰ = 8219527 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 (8220557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4110275 + 4110276.

It is an arithmetic number, because the mean of its divisors is an integer number (4110276).

Almost surely, 2^8220551 is an apocalyptic number.

8220551 is a deficient number, since it is larger than the sum of its proper divisors (1).

8220551 is an equidigital number, since it uses as much as digits as its factorization.

8220551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 8220551 is about 2867.1503274157. The cubic root of 8220551 is about 201.8212891836.

Adding to 8220551 its reverse (1550228), we get a palindrome (9770779).

The spelling of 8220551 in words is "eight million, two hundred twenty thousand, five hundred fifty-one".