8655421 has 2 divisors, whose sum is σ = 8655422. Its totient is φ = 8655420.

The previous prime is 8655403. The next prime is 8655433. The reversal of 8655421 is 1245568.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8491396 + 164025 = 2914^2 + 405^2 .

It is a cyclic number.

It is not a de Polignac number, because 8655421 - 2¹¹ = 8653373 is a prime.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8655401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4327710 + 4327711.

It is an arithmetic number, because the mean of its divisors is an integer number (4327711).

Almost surely, 2^8655421 is an apocalyptic number.

It is an amenable number.

8655421 is a deficient number, since it is larger than the sum of its proper divisors (1).

8655421 is an equidigital number, since it uses as much as digits as its factorization.

8655421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9600, while the sum is 31.

The square root of 8655421 is about 2942.0096872716. The cubic root of 8655421 is about 205.3191222408.

The spelling of 8655421 in words is "eight million, six hundred fifty-five thousand, four hundred twenty-one".