1298221 has 2 divisors, whose sum is σ = 1298222. Its totient is φ = 1298220.

The previous prime is 1298197. The next prime is 1298261. The reversal of 1298221 is 1228921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1297321 + 900 = 1139^2 + 30^2 .

It is a cyclic number.

It is not a de Polignac number, because 1298221 - 2¹⁹ = 773933 is a prime.

1298221 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1298261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 649110 + 649111.

It is an arithmetic number, because the mean of its divisors is an integer number (649111).

2^1298221 is an apocalyptic number.

It is an amenable number.

1298221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1298221 is an equidigital number, since it uses as much as digits as its factorization.

1298221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576, while the sum is 25.

The square root of 1298221 is about 1139.3950149092. The cubic root of 1298221 is about 109.0894812734.

The spelling of 1298221 in words is "one million, two hundred ninety-eight thousand, two hundred twenty-one".