1697321 has 2 divisors, whose sum is σ = 1697322. Its totient is φ = 1697320.

The previous prime is 1697317. The next prime is 1697347. The reversal of 1697321 is 1237961.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1155625 + 541696 = 1075^2 + 736^2 .

It is an emirp because it is prime and its reverse (1237961) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1697321 - 2² = 1697317 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1697351) 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, 848660 + 848661.

It is an arithmetic number, because the mean of its divisors is an integer number (848661).

2^1697321 is an apocalyptic number.

It is an amenable number.

1697321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1697321 is an equidigital number, since it uses as much as digits as its factorization.

1697321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2268, while the sum is 29.

The square root of 1697321 is about 1302.8127263732. The cubic root of 1697321 is about 119.2855932616.

The spelling of 1697321 in words is "one million, six hundred ninety-seven thousand, three hundred twenty-one".