1641217 has 2 divisors, whose sum is σ = 1641218. Its totient is φ = 1641216.

The previous prime is 1641161. The next prime is 1641229. The reversal of 1641217 is 7121461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1640961 + 256 = 1281^2 + 16^2 .

It is a cyclic number.

It is not a de Polignac number, because 1641217 - 2⁷ = 1641089 is a prime.

1641217 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1641617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820608 + 820609.

It is an arithmetic number, because the mean of its divisors is an integer number (820609).

2^1641217 is an apocalyptic number.

It is an amenable number.

1641217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1641217 is an equidigital number, since it uses as much as digits as its factorization.

1641217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 336, while the sum is 22.

The square root of 1641217 is about 1281.0999180392. The cubic root of 1641217 is about 117.9565338329.

Adding to 1641217 its reverse (7121461), we get a palindrome (8762678).

The spelling of 1641217 in words is "one million, six hundred forty-one thousand, two hundred seventeen".