1280221 has 2 divisors, whose sum is σ = 1280222. Its totient is φ = 1280220.

The previous prime is 1280183. The next prime is 1280231. The reversal of 1280221 is 1220821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 972196 + 308025 = 986^2 + 555^2 .

It is a cyclic number.

It is not a de Polignac number, because 1280221 - 2¹⁵ = 1247453 is a prime.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 1280195 and 1280204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1280231) 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, 640110 + 640111.

It is an arithmetic number, because the mean of its divisors is an integer number (640111).

2^1280221 is an apocalyptic number.

It is an amenable number.

1280221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1280221 is an equidigital number, since it uses as much as digits as its factorization.

1280221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 1280221 is about 1131.4685148072. The cubic root of 1280221 is about 108.5829531198.

The spelling of 1280221 in words is "one million, two hundred eighty thousand, two hundred twenty-one".