1694221 has 2 divisors, whose sum is σ = 1694222. Its totient is φ = 1694220.

The previous prime is 1694213. The next prime is 1694227. The reversal of 1694221 is 1224961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1297321 + 396900 = 1139^2 + 630^2 .

It is a cyclic number.

It is not a de Polignac number, because 1694221 - 2³ = 1694213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1694227) 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, 847110 + 847111.

It is an arithmetic number, because the mean of its divisors is an integer number (847111).

2^1694221 is an apocalyptic number.

It is an amenable number.

1694221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1694221 is an equidigital number, since it uses as much as digits as its factorization.

1694221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 25.

The square root of 1694221 is about 1301.6224490996. The cubic root of 1694221 is about 119.2129276326.

The spelling of 1694221 in words is "one million, six hundred ninety-four thousand, two hundred twenty-one".