1689601 has 2 divisors, whose sum is σ = 1689602. Its totient is φ = 1689600.

The previous prime is 1689553. The next prime is 1689607. The reversal of 1689601 is 1069861.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1560001 + 129600 = 1249^2 + 360^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1689601 is a prime.

It is not a weakly prime, because it can be changed into another prime (1689607) by changing a digit.

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

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 844800 + 844801.

It is an arithmetic number, because the mean of its divisors is an integer number (844801).

It is a Proth number, since it is equal to 825 ⋅ 2¹¹ + 1 and 825 < 2¹¹.

2^1689601 is an apocalyptic number.

It is an amenable number.

1689601 is a deficient number, since it is larger than the sum of its proper divisors (1).

1689601 is an equidigital number, since it uses as much as digits as its factorization.

1689601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 1689601 is about 1299.8465294026. The cubic root of 1689601 is about 119.1044677339.

The spelling of 1689601 in words is "one million, six hundred eighty-nine thousand, six hundred one".