1641709 has 2 divisors, whose sum is σ = 1641710. Its totient is φ = 1641708.

The previous prime is 1641659. The next prime is 1641713. The reversal of 1641709 is 9071461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1108809 + 532900 = 1053^2 + 730^2 .

It is a cyclic number.

It is not a de Polignac number, because 1641709 - 2¹⁵ = 1608941 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1641799) 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, 820854 + 820855.

It is an arithmetic number, because the mean of its divisors is an integer number (820855).

2^1641709 is an apocalyptic number.

It is an amenable number.

1641709 is a deficient number, since it is larger than the sum of its proper divisors (1).

1641709 is an equidigital number, since it uses as much as digits as its factorization.

1641709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 1641709 is about 1281.2919261433. The cubic root of 1641709 is about 117.9683195619.

The spelling of 1641709 in words is "one million, six hundred forty-one thousand, seven hundred nine".